Month: May 2019

SpaceX investigation into test explosion ongoing

8:19 am

A NASA update yesterday into SpaceX’s investigation into the test explosion that destroyed a manned Dragon capsule revealed that while the company is still working to launch humans by the end of the year, this schedule remains tentative until the investigation is completed.

The update included two important details. First, SpaceX is going to use for its launch abort test the Dragon capsule it had previously planned to fly on its first manned demo mission, and for that mission will use the capsule intended for the first operational manned flight. That first operational flight will then use a new capsule from their assembly line.

Second, the update confirmed that the anomaly that caused the explosion occurred as they were activating the SuperDraco thruster system, but prior to the firing of the thrusters. While this suggests once again that the failure might have not have involved the capsule but the test procedures, we will not know for sure until they release their investigation conclusions.

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Russian company announces plan to enter suborbital tourism industry

8:08 am

Capitalism in space? A new Russian company, CosmoCourse, claims it will be flying a reusable suborbital capsule for tourism and science by 2023, with manned flights to follow in 2025.

CosmoCourse is developing a reusable spacecraft for sub-orbital tourist flights. A crew of six persons and an instructor is expected to make a 15-minute flight to an altitude of about 200 km. The preparations for the flight will take one day. The first manned flight is planned for 2025.

The CosmoCourse chief executive earlier told TASS that the company had signed a contract with the Nizhny Novgorod Region in the Volga area on cooperation in the project of creating the first private spaceport in Russia. The corresponding documents were submitted to Russia’s State Space Corporation Roscosmos for approval. [emphasis mine]

I strongly suspect that this story will fall into the pile of hundreds of other stories that have come from Russian in the past two decades, promising much but in the end delivering nothing. The company appears to be just a piece of paper selling itself in the hope of raising investment capital. In Russia however such capital does not exist, as everything related to space is controlled by Roscosmos, as indicated by the highlighted text. To get built, this company must convince Roscosmos to fund it. And since its proposals will be a direct threat to the already established “companies” under Roscosmos’s control, I doubt the Russian space agency will be inclined to approve this competitive effort. The players in power will determine who gets the money, and it won’t be any new startups.

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Super Heavy/Starship construction now in SpaceX facilities in Texas and Florida

7:47 am

Capitalism in space: Even as it prepares for more Starhopper vertical test flights next month, SpaceX has now initiated Super Heavy/Starship construction in its facilities in both Boca Chica, Texas, and Cape Canaveral, Florida.

SpaceX is working a dual test flow for its new Super Heavy and Starship systems, with construction ongoing in Florida while Starhopper prepares to restart test operations in Texas. Two orbital Starship prototypes are now in staggered stages of production while the first Super Heavy booster is set to begin construction in the next three months. However, the focus will soon return to Starhopper, as it prepares for an incremental series of untethered test hops.

Earlier this month it came to light that SpaceX crews at Cocoa Beach in Florida were starting to assemble a second orbital Starship prototype vehicle, similar to the first of such articles that are currently located at the company’s launch and testing facility in Boca Chica, Texas.

According to SpaceX CEO Elon Musk, these two builds were going to be the center of a cooperative/competitive effort between the two sites and their respective team members, in which they would share insights and lessons learned during development – although they were not required to put them to use.

There is another aspect to this that must be emphasized. Super Heavy and Starship are not rockets as we have come to think of them. They are the names for a class of vehicle, each of which is intended to fly many times. SpaceX is therefore not building the first version of a throwaway rocket, but a ship it will use over and over. Because of this, they are not going to be building many of these ships, as you would with an expendable rocket. Instead, they are going to build only a handful, like a ship company that builds luxury ocean liners.

Building two ships simultaneously thus allows them to hone the engineering more quickly and efficiently. It also means that when they are done, SpaceX will have two giant space liners for getting people and cargo into orbit, literally a small fleet that will give them redundancy and make quick flight turnarounds possible.

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Signals detected from experimental satellite that failed in 1967

9:35 pm

NASA has confirmed that the signals detected in 2016 do come from an experimental satellite, LES-1, that failed in 1967.

LES stands for Lincoln Experimental Satellite, and was the first in a series of test satellites built by MIT’s Lincoln Laboratory for the Air Force. It was launched on February 11, 1965. Though it was reported to be operating properly, it was placed in an incorrect orbit that made its experiments useless. It ceased transmissions in 1967 and was thought lost, until amateur astronomer Phil Williams picked up a signal in 2016.

Williams told Southgate Amateur Radio News that the signal he detected from his base in Cornwall seemed to cycle every four seconds, diminishing and returning to create an eerie repetitive sound.

It would later be determined that the fluctuation was the result of the long-lost satellite barreling end over end through the void of space, causing variations in the light reaching the solar panels that Gunter’s Space Page says likely now power the depleted batteries of this 65 lb (30 kg) relic of the space age.

Scientists are unclear as to how the satellite continues to operate — Williams himself expressed some uncertainty as to how the craft might continue to function given the particularly harsh environment of space and its tendency to destroy electronic equipment.

This story is nothing more than a curiosity, but a fine one nonetheless.

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Scientists propose planetary orbital alignments cause the sunspot cycle

10:15 am

The uncertainty of science: Scientists today proposed a new model that says the orbital alignments of the planets, most especially Venus-Earth-Jupiter, act to initiate the eleven-year solar sunspot cycle.

As with the gravitational pull of the Moon causing tides on Earth, planets are able to displace the hot plasma on the Sun’s surface. Tidal forces are strongest when there is maximum Venus-Earth-Jupiter alignment; a constellation that occurs every 11.07 years. But the effect is too weak to significantly perturb the flow in the solar interior, which is why the temporal coincidence was long neglected. However, the HZDR researchers then found evidence of a potential indirect mechanism that may be able to influence the solar magnetic field via tidal forces: oscillations in the Tayler instability, a physical effect that, from a certain current, can change the behavior of a conductive liquid or of a plasma. Building on this concept, the scientists developed their first model in 2016; they have since advanced this model in their new study to present a more realistic scenario.

More details at the link. To put it mildly, this theory is far from proven. While they mention how it might also cause grand minimums and double-peaked maximums, they are somewhat vague in explaining this process. If valid, however, they should be able to use this model to predict future cycles, including the possible arrival of a new grand minimum in the coming decades.

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Future lunar colonies at Shackleton Crater at the Moon’s south pole

9:52 am

The rim of Shackleton Crater
Click for full image.

The Lunar Reconnaissance Orbiter (LRO) science team has released a new image of the rim of Shackleton Crater, reduced slightly in resolution to post here on the right. The Moon’s south pole is located on the crater’s rim near the top right of this image. As they note at the link, the interior of Shackleton never gets any sunlight, making it what scientists call a Permanently Shadowed Region (PSR), while a ridgeline running south to de Gerlache Crater gets sunlight 90% of the time.

An elevated ridge runs roughly between Shackleton and de Gerlache craters, and the relatively high elevation of this landscape means that some portions are illuminated up to 90% of the time, but nowhere is permanently illuminated. Future explorers could take advantage of this persistent illumination by setting up solar panels in several closely spaced locations providing nearly constant solar generated electricity.

The proximity to Permanently Shadowed Regions in and around Shackleton crater adds scientific value to this destination, as PSRs are often home to compounds such as water ice that are not found elsewhere on the Moon, but which contain clues to the history of of inner Solar System water and other volatile elements. A nearby, ready source of water-ice would also be of benefit to human surface activities, either as a consumable (air or water) or as spacecraft fuel.

Below is a more detailed map they provide showing this area, with the permanently shadowed regions shaded in blue. The green dot indicates the location of the south pole. The green arrows indicate regions in sunlight in the full image.

The region around Shackleton

Sadly, I expect we are looking at the locations of future Chinese and Indian lunar bases. Though the U.S. has done all the proper legwork to find out the exact locations to build a lunar base at Shackleton, our government has decided we will instead twiddle our thumbs in lunar orbit while other countries use our legwork to land and establish bases on the Moon itself.

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Hayabusa-2’s second approach to artificial crater scheduled

9:33 am

Ryugu impact site
Click for full image.

Based on images obtained during the aborted early May close-in approach to the asteroid Ryugu, the Hayabusa-2 science team was able to get better imagery of the location of their man-made impact site,, and this has allowed them to both reschedule to May 28-30 the next close approach, as well as more accurately aim the spacecraft at that artificial crater.

The image on the right shows the artificial crater as the dark area inside the box labeled C01, their new target site. The S01 box was the target location for the mid-May aborted approach.

The goal of these close-in approaches is to drop a reflective target at the site, giving them a very precise reference point for the touch-and-go sample grab to follow. They were unable to make the drop on the aborted close-in approach, and will attempt it again in this week’s second attempt.

The second link above provides a detailed minute-by-minute outline of this week’s approach. As before, you can watch it happen with the live download of navigation images every thirty minutes or so. A link to that real-time image delivery will be found here.

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OSIRIS-REx moves into new science phase

9:01 am

The OSIRIS-REx science team has shifted the spacecraft’s operation into a new phase aimed at carefully mapping the surface of the asteroid Bennu in preparation for an eventual touch-and-go sample grab.

During Detailed Survey: Equatorial Stations phase, the spacecraft’s instruments will make the scientific observations needed to help the team home in on the best location on Bennu to collect a sample of regolith (loose surface material). To obtain these data, the spacecraft will execute a series of slews between Bennu’s north and south poles while taking observations from seven different stations above the equator. These data will be studied to understand the geology of Bennu. The spacecraft will also conduct searches for dust and gas plumes.

During this phase, planned to last through mid-June, they are asking for the public’s help in mapping the surface and its innumerable rocks.

For this effort, NASA is partnering with CosmoQuest, a project run out of the Planetary Science Institute that supports citizen science initiatives. Volunteers will perform the same tasks that planetary scientists do – measuring Bennu’s boulders and mapping its rocks and craters – through the use of a simple web interface. They will also mark other scientifically interesting features on the asteroid for further investigation.

The boulder mapping work involves a high degree of precision, but it is not difficult. The CosmoQuest mapping app requires a computer with a larger screen and a mouse or trackpad capable of making precise marks. To help volunteers get started, the CosmoQuest team provides an interactive tutorial, as well as additional user assistance through a Discord community and livestreaming sessions on Twitch.

Seems like fun!

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Foreign elections: UK, India, France, Italy, Israel

6:16 pm

Foreign elections in the past week all suggest that Trump’s victory in the U.S. is no accident, and that our so-called betters in the elitist class in DC had better recognize this or they will find themselves out of work.

In Europe supporters of the European Union generally got crushed:

Turn-out was up across the board, which with these victories for the populist parties also indicates the public favors them, and wanted to give them victories. As one would expect, the press has routinely labeled the winners here as “far-right,” a slander aimed at discrediting them.

The European Union was without doubt a good idea. Sadly, its implementation by the elitists in Europe was terrible, as bad if not worse then the terrible job the U.S. establishment has done for the past three decades, failing to do anything right while simultaneously drowning the country in debt and stifling regulation.

Meanwhile in India, the government of Prime Minister Narendra Modi came away with a landslide victory. In many ways Modi’s win mirrors the European elections. Overall, Modi has worked to shift India away from the centralized socialist/communist policies that dominated its government in the last half of the 20th century, policies that are very similar to the policies followed by the ruling EU parties. In India those centralized policies worked as badly as they have in Europe and the U.S., which is why they experienced a political collapse.

Modi’s shift to private enterprise has resulted in a booming economy and great prosperity, so much so that it has allowed India to expand its space program significantly.

Finally, in Israel, the victory several weeks ago of Benjamin Netanyahu’s right-wing coalition has not yet resulted in a new government. It appears Netanyahu is having trouble forming a government.

Prime Minister Binyamin Netanyahu announced that he would meet with the leaders of the prospective coalition parties in the coming hours in a final effort to save the new government and avert new elections. “I am now making my last-ditch effort to form a right-wing government and to prevent unnecessary elections. I gave the partners a proposal for a solution. It is based on the principles that the army has established and on the data that the army has established – there is no reason to reject it, “Netanyahu said.

It appears that the conservative haredi religious parties that normally ally themselves with Netanyahu’s Likud party have been playing hard ball, preventing an agreement. In other words, the demand is that the government shift even more righward, a pattern comparable to Europe.

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NASA awards Maxar Gateway power/communications contract

1:26 pm

The never-ending boondoggle: NASA this week awarded the company Maxar its first official Lunar Gateway contract to develop the power, propulsion, and communications systems for the station.

Interestingly, the contract is structured somewhat similar to the commercial contracts for ISS cargo and crew.

This firm-fixed price award includes an indefinite-delivery/indefinite-quantity portion and carries a maximum total value of $375 million. The contract begins with a 12-month base period of performance and is followed by a 26-month option, a 14-month option and two 12-month options.

Spacecraft design will be completed during the base period, after which the exercise of options will provide for the development, launch, and in-space flight demonstration. The flight demonstration will last as long as one year, during which the spacecraft will be fully owned and operated by Maxar. Following a successful demonstration, NASA will have the option to acquire the spacecraft for use as the first element of the Gateway. NASA is targeting launch of the power and propulsion element on a commercial rocket in late 2022. [emphasis mine]

It is fixed-price, and Maxar will own the design with the ability to sell it to others as well as NASA.

The problem is that Maxar will not be building something that others might want. Their only customer will be NASA, and the design will be focused entirely to NASA’s needs in building their Gateway boondoggle. I am pessimistic anything productive for the future of space travel will come from this.

Moreover, the highlighted words reveal the corrupt nature of this deal. Development could go on forever, and should it do so, do not be surprised if the contract’s fixed price nature gets changed.

Our federal government, including NASA, is very corrupt. They are not interested in the nation’s interest, only the interests of themselves and the contractors they work hand-in-glove with in DC.

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SpaceX raises more than a billion in investment capital

10:28 am

Capitalism in space: SpaceX announced this week that it has raised more than a billion dollars in investment capital.

The launch provider turned satellite operator raised $486.2 million in one round, and $535.7 million in another, the company said in May 24 filings to the U.S. Securities and Exchange Commission.

The filings show SpaceX sold all but $18.8 million of the shares available between the two rounds. The company raised $1.022 billion in total.

It appears the money will be used to finance the construction of both Super Heavy/Starship and their Starlink satellite constellation. The article also notes that SpaceX generated $2 billion in revenues last year. All told, the company seems to be in very healthy shape financially.

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Boeing completes Starliner thruster tests

10:23 am

Capitalism in space: Almost a year after the company experienced a fuel leak during thruster tests of its Starliner manned capsule, Boeing announced this week that those tests have now been completed successfully.

In a statement, Boeing said it completed hot-fire testing May 23 of the spacecraft’s entire propulsion system, including various thrusters, fuel tanks and related systems within a “flight-like” service module of the spacecraft. Those tests took place at NASA’s White Sands Test Facility in New Mexico.

A series of tests demonstrated thruster firings for in-space maneuvers, high-altitude aborts and low-altitude aborts. The company said the tests were all successful.

They now plan their launchpad abort test this summer.

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Trump give Barr authority to declassify documents related to campaign spying by Obama

1:44 am

President Trump yesterday gave Attorney General William Barr the authority to declassify any documents related to the campaign spying by the Obama administration that occurred during the 2016 presidential election.

Trump also ordered all intelligence agencies to cooperate completely with Barr’s investigation, an order that common sense says should be unnecessary, as Barr is their boss and they should therefore always cooperate with him. However, we live in interesting times, when federal employees now think they have the right to tell elected officials what to do, and to even act to overthrow those elected officials if they don’t like them.

Not surprisingly, the Democrats who repeatedly scream for transparency and the public release of all documents are protesting Trumps orders.

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SpaceX successfully launches 60 prototype Starlink satellites

12:34 am

Capitalsm in space: SpaceX this morning successfully launched 60 prototype Starlink satellites as the first part of their planned constellation of thousands of satellites designed to provide worldwide internet access.

The first stage, already used twice before, landing successfully on their drone ship. You can watch the launch here.

The leaders in the 2019 launch race:

7 China
6 SpaceX
4 Europe (Arianespace)
3 Russia
3 India

The U.S. now leads China 11 to 7 in the national rankiings.

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To repeat: No obscenities on Behind the Black

12:24 am

I am getting really tired of saying this: I will not tolerate obscenities or curse words on this website. The rest of the world might want to wallow in barbarism and ill behavior, but it will not happen here. This is my workplace. If you want to participate in the conversation on Behind the Black, I expect you to act like a civilized adult. If you can’t abide by these rules, then go somewhere else.

First time offenders who are new to the site will be warned. Second time offenders or first time offenders who have been here awhile will be suspended for a week. After that, I will ban you. Period.

Civilization might be collapsing all around us, but at least in this tiny corner I wish to try to keep it upright.

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House ignores request for more NASA money for moon mission

3:20 pm

A House committee today approved a NASA budget that ignored the Trump administration’s request for $1.6 billion more money to support its attempt to land a manned mission on the Moon by 2024.

Instead, the committee shifted more money into earth science and Gateway.

Whether this budget is what ends up being enacted remains to be seen. It does appear however that Trump will have great trouble funding his Moon project. Sadly, that lack of funding does not mean the overall federal budget is coming under control. On the contrary, it appears the Democratic-controlled House simply wants to spend lots of money, but on different things.

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Justice charges man with falsifying inspection reports for rocket parts

3:12 pm

The Justice Department has charged an employee of a company now out of business for falsifying inspection reports of rocket parts intended for use on both the Falcon 9 and Falcon Heavy rocket.

The complaint states that in January 2018, an internal audit by SQA Services, Inc. (SQA), at the direction of SpaceX, revealed multiple falsified source inspection reports and non-destructive testing (NDT) certifications from PMI Industries, LLC, for Falcon 9 and Falcon Heavy flight critical parts. SpaceX notified PMI of the anomalies. Source inspections and NDT are key tools used in the aerospace industry to ensure manufactured parts comply with quality and safety standards. Specifically, the signed source inspection report had a forged signature of the SQA inspector. SpaceX and SQA officials believed the signature of the inspector was photocopied and cut and pasted onto the source inspection report with a computer.

On February 16, 2018, the NASA Launch Services Program alerted the NASA Office of Inspector General (OIG), and Kennedy Space Center (KSC) Resident Agency, regarding the falsified source inspection reports and false NDT certifications created by PMI. Some of the false source inspection reports and false NDT certifications were related to space launch vehicle components that, at the time of discovery, were to be used for the upcoming Transiting Exoplanet Survey Satellite (TESS) mission, which launched from a SpaceX Falcon 9 rocket on April 18, 2018.

Based on this report, it appears that SpaceX identified the problem before launch and that none of the questionable parts ever flew.

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China has launch failure

3:00 pm

A Chinese launch of a military satellite using a Long March 4C rocket failed today.

It appears the failure occurred with the third stage. This rocket is one of China’s smaller rockets, and is mostly used for polar launches of smaller satellites. It is likely therefore that the failure will not impact their planetary and manned programs, both of which depend on different and larger rockets.

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SpaceX suing Air Force due to exclusion from development contracts

2:50 pm

SpaceX has initiated a lawsuit against the Air Force for excluding the company from the rocket development contracts totaling $2.3 billion that it issued last year to ULA, Blue Origin, and Northrop Grumman.

The full SpaceX complaint alleges that the Air Force’s Space and Missile Systems Center “wrongly awarded” the funds “to a portfolio of three unproven rockets based on unstated metrics.” Under the Launch Service Agreement (LSA) program, the Air Force awarded three SpaceX competitors funding to develop new launch systems. The LSA awards granted $500 million to Blue Origin for its New Glenn rocket, $792 million to Northrop Grumman for its OmegA rocket and $967 million to ULA for the Vulcan Centaur rocket.

“By any reasonable measure, SpaceX earned a place in the LSA portfolio,” the complaint said.

I had guessed last year that SpaceX had decided not to bid for this money because of the strings the Air Force would attach to the development of Super Heavy/Starship. According to this lawsuit, that guess was wrong. SpaceX wanted its own share in this government cash, and didn’t get it.

Considering how Air Force requirements appeared to immediately slow down the development for ULA and Blue Origin, I still think SpaceX is better off without the cash. They have had to raise money from the private sector, and so far appear to have been successful in doing so, without those strings attached.

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London and art

7:56 am

Trafalgar Square

Yesterday we took the train to London and settled into a really super modern hi-tech hotel dubbed “The Hub by Premier Inns.” It is also the crummiest hotel I have ever stayed at. I picked it because it was well recommended and was located less than a block from Trafalgar Square, shown on the right. And yes, it is new and fancy, with motion-controlled LED lights and fancy touch buttons and aps to control everything. It is also tiny, cramped, the controls are too limited and too difficult to decipher, even for a science journalist like myself. I suppose I shouldn’t complain, as it was reasonable in price considering the location. I still dislike the hi-tech nature of the room that only ended up limiting our convenience and comfort.

And the hotel didn’t even have an ice machine!

National Gallery in London

Today we wandered about the square, watching the street performers (buskers in British lingo) and admiring the statues and sights. Then we went into the National Gallery to enjoy some of humanity’s greatest art, as were a class of elementary school children as shown in the picture on the right.

The museum was packed with people from everywhere. I saw Japanese, Chinese, and Israeli tour groups. I saw people of all types clearly from London, including several school groups like the one to the right.

Interestingly, these crowds were all found in the permanent exhibits. One temporary exhibit we wandered through, art by an modern abstract artist by the name of Sean Scully, was practically empty.
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Trump walks out of infrastrucure negotiations

1:31 am

President Trump immediately walked out of a meeting with House Speaker Nancy Pelosi (D-California) and Senator Chuck Schumer (D-New York) yesterday, saying he will hold no discussions on infrastructure as long as the Democrats continue their investigations into his administration.

Trump’s anger appears to have been sparked by comments Pelosi made earlier in the day when she said, “We believe the president of the United States is engaged in a cover-up” by blocking White House aides from giving testimony and responding to document requests from ongoing congressional investigations.

“I don’t do cover-ups,” Trump insisted Wednesday.

The article suggests that Trump planned this as a way to get out of the negotiations. Maybe, but I think his goal is to get the investigations stopped. He is quite willing to make a deal to spend trillions that we don’t have on “infrastructure,” as are the Democrats. By walking out he is putting pressure on the Democratic leadership to shut those investigations down in order to get him to work out a deal to spend the money they also want.

The result, for the moment, is that we have no infrastructure deal. I hope this stalemate lasts forever.

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India’s PSLV launches Earth observation radar satellite

8:13 am

India’s PSLV rocket today successfully put a radar satellite designed to do Earth observations into orbit.

The leaders in the 2019 launch race:

7 China
5 SpaceX
4 Europe (Arianespace)
3 Russia
3 India

That India at this stage ties Russia says as much about India’s growing presence as a space power as it does about Russia’s fading presence.

In the national rankings, the U.S. still leads China 10 to 7.

Note: This and the last few posts were written from our hotel in London, near Covent Garden.

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New Zimmerman op-ed at American Greatness

7:42 am

Link here. To my readers some of this will seem familiar. To those who listened to my last appearance on the Space Show, it will also seem familiar. I decided what I had written and said in both places needed a more detailed essay. Key quote:

Every single big space project since the founding of NASA has always been proposed and approved by elected officials. NASA officials might have lobbied for one version or another, but always, always, it was understood and accepted that the project did not exist without first getting an enthusiastic and very public authorization from elected officials.

What was understood without question was that the right to make these fundamental policy decisions belonged only to the lawmakers, elected as they were by the citizenry under the Constitution.

NASA’s new Lunar Gateway project, however, is something altogether different. It was conceived, designed, and proposed by the big aerospace companies Lockheed Martin and Boeing as a justification for the continuing construction of SLS and Orion. It was added as a budget line item by NASA bureaucrats who supported it, and it now exists as a growing major space project comparable to Apollo, the Space Shuttle, ISS, and SLS/Orion.

Yet no president has ever officially and publicly proposed the Lunar Gateway. No Congress ever reviewed or endorsed the program. All these elected officials have done is simply to accept the will of NASA bureaucrats and large aerospace contractors, and rubber-stamp that line item in NASA’s budget.

Thus, unlike all past big space projects, Gateway stands alone as the only one to be proposed and approved not by our elected officials, but by the vendors who will build it and by the unelected NASA bureaucrats who will manage it.

Worse, Gateway’s growing year-by-year funding and development is being controlled not by lawmakers or the president but by those very same bureaucrats.

Essentially, this is a coup by NASA’s bureaucracy and the big space contractors over the power of elected officials.

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Three exocomets found circling Beta Pictoris

7:31 am

The uncertainty of science: By analyzing data from the new space telescope TESS, astronomers think they have identified three exocomets orbiting the nearby star Beta Pictoris.

Why do I label this uncertain? Let the scientists themselves illustrate my doubt:

Sebastian Zieba, Master’s student in the team of Konstanze Zwintz at the Institute of Astro- and Particle Physics at the University of Innsbruck, discovered the signal of the exocomets when he investigated the TESS light curve of Beta Pictoris in March this year. “The data showed a significant decrease in the intensity of the light of the observed star. These variations due to darkening by an object in the star’s orbit can clearly be related to a comet,” Sebastian Zieba and Konstanze Zwintz explain the sensational discovery.

The press release provides no other information about why they think this darkening is because of comets rather than exoplanets or some other phenomenon. Based on this alone, I find this report very doubtful and highly speculative.

In related news, astronomers now claim they have detected eighteen more Earth-sized exoplanets in the data produced by Kepler, and they have done so by applying new algorithms to the data.

Large planets tend to produce deep and clear brightness variations of their host stars so that the subtle center-to-limb brightness variation on the star hardly plays a role in their discovery. Small planets, however, present scientists with immense challenges. Their effect on the stellar brightness is so small that it is extremely hard to distinguish from the natural brightness fluctuations of the star and from the noise that necessarily comes with any kind of observation. René Heller’s team has now been able to show that the sensitivity of the transit method can be significantly improved, if a more realistic light curve is assumed in the search algorithm. “Our new algorithm helps to draw a more realistic picture of the exoplanet population in space,” summarizes Michael Hippke of Sonneberg Observatory. “This method constitutes a significant step forward, especially in the search for Earth-like planets.”

This makes sense, but it must be understood that these are only candidate exoplanets, unconfirmed as yet. I would not be surprised if a majority are found to be false positives.

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