Tabby’s Star dims again

8:37 am

Scientists studying Tabby’s Star have revealed that it suddenly dimmed last week, the most since 2013, and then just as quickly returned almost to normal.

The latest dimming event started with a slow decline and ended with a rapid increase in brightness, Boyajian and her team wrote on their blog. Dust from a backward comet tail and then larger chunks from the broken-up body would explain that uneven pattern.

At this time the evidence clearly points not to alien megastructures but to clouds of fine dust whose structure and origin remain puzzling.

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Genesis cover

On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.

 

The print edition can be purchased at Amazon or any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.


The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
 

"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News

Tiangong-1 re-entry narrowed to four days centered on April 1

11:27 am

Tiangong-1's likely landing locations

China’s first space station, Tiangong-1, is now predicted to crash to Earth in a window that has been narrowed to four days centered on April 1. The map to the right shows the station’s most likely landing areas, with yellow the most likely, green less likely, and blue not at all. Essentially, there is about a 50-50 chance the station will come down in the north mid-latitudes, with about a 70 percent chance it will land in water if it does so.

Thus, the odds of the station hitting a populated area is not large, but it definitely exists. We will not know the exact area of impact until very close to the moment the station finally comes down.

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SpaceX using up old used boosters as it shifts to final Falcon 9 design

8:27 am

Capitalism in space: As SpaceX prepares to introduce its final Falcon 9 design, dubbed Block 5, it also plans to use up its stock of old used boosters, with four of the six launches scheduled through the end of April using previously flown boosters.

The article’s review of SpaceX’s stock suggests that the company will only have two used boosters after these launches. It also notes that the company appears to have decided that these earlier Falcon 9 designs can only fly two or three times safely, and that it will be the Block 5 final design that they hope will finally be the booster that can fly repeatedly and reliably.

Since NASA won’t let astronauts fly on anything other than Block 5, and insists it fly at least seven times successfully before the agency will allow its astronauts on it, SpaceX has a lot at stake with this final design. If it has problems, the company will be in trouble. If not, the company will cement the dominate position it presently holds in the launch industry.

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Conscious Choice cover

Now available in hardback and paperback as well as ebook!

 

From the press release: In this ground-breaking new history of early America, historian Robert Zimmerman not only exposes the lie behind The New York Times 1619 Project that falsely claims slavery is central to the history of the United States, he also provides profound lessons about the nature of human societies, lessons important for Americans today as well as for all future settlers on Mars and elsewhere in space.

 
Conscious Choice: The origins of slavery in America and why it matters today and for our future in outer space, is a riveting page-turning story that documents how slavery slowly became pervasive in the southern British colonies of North America, colonies founded by a people and culture that not only did not allow slavery but in every way were hostile to the practice.  
Conscious Choice does more however. In telling the tragic history of the Virginia colony and the rise of slavery there, Zimmerman lays out the proper path for creating healthy societies in places like the Moon and Mars.

 

“Zimmerman’s ground-breaking history provides every future generation the basic framework for establishing new societies on other worlds. We would be wise to heed what he says.” —Robert Zubrin, founder of the Mars Society.

 

All editions are available at Amazon, Barnes & Noble, and all book vendors, with the ebook priced at $5.99 before discount. All editions can also be purchased direct from the ebook publisher, ebookit, in which case you don't support the big tech companies and the author gets a bigger cut much sooner.

 

Autographed printed copies are also available at discount directly from the author (hardback $29.95; paperback $14.95; Shipping cost for either: $6.00). Just send an email to zimmerman @ nasw dot org.

Failure history of the Russian launch industry

8:09 am

Doug Messier has compiled a detailed and what appears to be a complete list of all Russian/Soviet launch failures going back to 1988. As he says, “Launch failures are not a bug in the system, they’re a feature.”

What struck me most about his graph is the number of Soyuz rocket failures. For decades, various versions of this rocket have been used to bring astronauts up to either Mir or ISS, and because there have not been any launch failures during those manned launches, the impression given is that the Soyuz is one of the most reliable rockets in existence. Messier’s table proves that impression false, and also tells us that the Russians, and the United States, have been very lucky that no lives have been lost in the past three decades on any Soyuz launches.

The table also illustrates why commercial customers have been so quick to shift their business from the Russians to SpaceX. The Russians have not provided a very good or reliable product. Since 1988 there have only been two years, 2001 and 2003, in which the Russians had no failures. And the table indicates that their failure rate has increased in the past decade.

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Leaving Earth cover

Leaving Earth: Space Stations, Rival Superpowers, and the Quest for Interplanetary Travel, can be purchased as an ebook everywhere for only $3.99 (before discount) at amazon, Barnes & Noble, all ebook vendors, or direct from my ebook publisher, ebookit.

 

If you buy it from ebookit you don't support the big oppressive tech companies and I get a bigger cut much sooner.

 

Winner of the 2003 Eugene M. Emme Award of the American Astronautical Society.

 
"Leaving Earth is one of the best and certainly the most comprehensive summary of our drive into space that I have ever read. It will be invaluable to future scholars because it will tell them how the next chapter of human history opened." -- Arthur C. Clarke

India delays Chandrayaan-2 six months

5:46 pm

Because engineers wished more time, India has delayed the launch of its second unmanned Moon mission, Chandrayaan-2, from April to October.

Union Minister of State in the Prime Minister’s Office, in-charge of the Department of Space, Jitendra Singh had on 16 February last said the lunar mission under which the Isro will for the first time attempt to land a rover on the moon’s south pole, will be launched in April.

Sivan (head of ISRO) had earlier said the window to launch the Rs800 crore mission was between April and November 2018. While the “targeted date” was April, Isro would launch the mission in October or November, he had said.

This is a very ambitious mission, so pushing the launch back to October seems quite reasonable. That they are aiming for the south pole is also smart, especially since NASA has abandoned that location as a target to instead build a giant Potemkin village orbiting the Moon, where it can accomplish nothing.

Posted between Flagstaff and Phoenix as we head back from a very successful four-day caving expedition in the Grand Canyon.

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Congress pumps pork money to NASA in omnibus budget

7:45 am

The omnibus budget that Congress plans to pass this week for 2018 gives NASA $20.7 billion, significantly more than requested and funding almost every pork project Congress could conceive of, including a second mobile launcher for SLS.

The budget gives SLS and Orion more than $3 billion, funds all the Earth science and education projects the Trump administration wished to cut, as well as WFIRST, which the Trump administration wants to cancel because of cost overruns. In general, the NASA budget is a microcosm of the entire spending bill, which does nothing to cut any program anywhere, including Obamacare and a number of liberal programs that the Republicans have repeatedly promised to shut down, until they are in a position to do so. Then they act like leftist Democrats and fund everything.

This is posted between Tucson and Phoenix. I am heading up to the Grand Canyon for a four day cave expedition, which is why I can’t do a more thorough analysis. This really isn’t necessary however, as it is very clear that the Republican leadership in Congress are continuing their corrupt passion for spending money that does not exist. And they wonder why they may lose seats in 2018.

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Mars rover update: March 21, 2018

2:10 pm

Summary: Curiosity continues its exploration of Vera Rubin Ridge, including several drilling attempts. Opportunity is halfway down Perseverance Valley.

For a complete list of all past updates going back to July 2016, see my February 8, 2018 update.

Curiosity

Curiosity's traverse map, Sol 1993

For the overall context of Curiosity’s travels, see Pinpointing Curiosity’s location in Gale Crater.

Since my February 8, 2018 update, the Curiosity science team has apparently been loath to leave Vera Rubin Ridge. They had begun the trek to the northeast that would take them towards the exit ridge heading to the southeast, as indicated by the dotted red line on the traverse map above, but then continued past that planned route to continue to the northeast. Along the way they attempted to drill twice using an improvised approach that they hoped would bypass the drill’s stuck feed mechanism, without apparent success.

The panorama below is looking to the west and south, as indicated by the yellow lines in the image above.
» Read more

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SpaceX’s August launch created largest shockwave from rocket ever measured

9:23 am

The August launch by SpaceX of a communications satellite created the largest rocket shockwave in the atmosphere ever measured.

In the new study, Lin and his colleagues used GPS signals to determine how the FORMOSAT-5 launch affected the upper atmosphere. They found Falcon 9’s vertical trajectory created a circular shock wave above the western United States that had never before been seen from a rocket launch. The only similarly-shaped shock wave Lin had seen was from an eruption of Russia’s Sarychev volcano in June 2009.

Not only was the shock wave circular, it was also the largest one Lin had ever seen – roughly four times the area of California. In the new study, he ran computer simulations of rocket launches and found the momentum from a vertical trajectory would tend to create a much stronger atmospheric disturbance than a curved one, which could explain why the shock wave was so large.

In addition to creating a gigantic shock wave, the launch created a hole in the ionosphere above California. Water vapor in the rocket’s exhaust reacted with the ionosphere’s charged particles to create a hole in the plasma layer that took up to two hours to recover.

The rocket’s vertical trajectory was because the overall payload was light. Heavier payload cause the trajectory to curve more as the rocket rises.

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The mysterious upcoming commercial launch in Alaska

8:08 am

Link here. The article takes a detailed look to try to find out the unnamed commercial company behind the mid-April launch, and learns that it will be a suborbital launch, and that the company might be one called Astra Space.

Alaska Aerospace signed a contract with Astra Space in 2017 to support launches of that company’s vehicle from PSCA, according to the minutes of an Alaska Aerospace board of directors meeting in August 2017.

Alaska Aerospace “has a contract with Astra to support the first four launches of their small liquid fuel commercial launch vehicle from PSCA. The first launch is planned for December 2017,” the minutes state. It added that it would be the first liquid-propellant launch from the spaceport, which previously had hosted only solid-fuel rockets. “This will be a very innovative launch.”

Minutes from a Nov. 2 meeting of the Alaska Aerospace board stated that “Astra is moving forward” with plans, holding weekly planning teleconferences and paying a $100,000 deposit for a launch date. That launch was planned at that time for “possibly February or later.”

It appears the company is doing work for both NASA and DARPA, the latter of which might explain the secrecy. Or maybe the company is taking the Blue Origin approach, keeping things close to the vest until they are sure of success.

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Japan creates $1 billion fund for private space start-ups

7:59 am

The new colonial movement: Japan’s government has created a $940 million fund that will be used to help new space companies get started.

The funds will be made available through investments and loans over the next five years, as part of a government-led initiative to double Japan’s more than $11 billion space industry. With less than 20 Japanese space start-ups currently operating, many see this as critical to helping new companies cover costs such as research or applying for patents. “We believe this will be remembered as a turning point for our burgeoning industry,” Takeshi Hakamada, CEO and founder of lunar exploration start-up ispace, said in a statement.

Ispace has received government backing in the past, including during a recent $90.2 million round of funding that included Suzuki Motor and Japan Airlines. Founded seven years ago, ispace is stepping beyond the Google-backed Lunar XPRIZE competition to fund two exploration missions to the moon, with the first by the end of 2019 and the second by the end of 2020.

The Japanese government is setting up an agency to manage the funds and connect start-ups with local talent from organizations such as the Japan Aerospace Exploration Agency or the rocket-building arm of Mitsubishi Heavy Industries. Initially, start-ups will be eligible to each receive about $100,000 in aid to help present concepts to investors. Promising ventures and more mature companies will be able to tap into the rest of the $940 million fund to further development.

More details here.

The most interesting aspect however of this new effort is the decision by Japan to also review its space law in order to encourage private ownership in space.

Japan also announced it is considering new laws and policies that would allow businesses to own plots of land developed on the moon, in a similar manner to the laws passed by the United States and Luxembourg. So far, the U.S. and Luxembourg are the only two countries in the world to have passed laws giving corporations ownership of materials mined in space, but only after they’ve been extracted. That legal framework has seen the tiny European country attract dozens of space companies, with another 70 space companies looking to establish in Luxembourg, according to Deputy Prime Minister Etienne Schneider.

They will find, as have the U.S. and Luxembourg as well as UAE, the United Kingdom, and a number of other countries that have reviewed the Outer Space Treaty, that this legal framework under this treaty will not work well, and still leaves the ownership rights of private companies very vulnerable. To protect property rights in space, either the Outer Space Treaty has to be changed to allow the establishment of national borders and laws, or dumped entirely.

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March 19, 2018 Zimmerman Space Show podcast

11:19 am

My two hour appearance with David Livingston on the Space Show last night is now available and can be downloaded as a podcast here.

This show was particularly interesting because of the high quality of questions from the callers. In fact, in many ways I think it might have been one of my most interesting Space Show appearances in a long time. Definitely worth a listen.

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Star’s close approach 70,000 years ago pinned to cometary orbits

10:03 am

Astronomers now think they have pinned the orbits of about 340 comets to another star’s close approach to our solar system 70,000 years ago.

About 70,000 years ago, when the human species was already on Earth, a small reddish star approached our solar system and gravitationally disturbed comets and asteroids. Astronomers from the Complutense University of Madrid and the University of Cambridge have verified that the movement of some of these objects is still marked by that stellar encounter. At a time when modern humans were beginning to leave Africa and the Neanderthals were living on our planet, Scholz’s star – named after the German astronomer who discovered it – approached less than a light-year from the Sun. Nowadays it is almost 20 light-years away, but 70,000 years ago it entered the Oort cloud, a reservoir of trans-Neptunian objects located at the confines of the solar system.

This discovery was made public in 2015 by a team of astronomers led by Professor Eric Mamajek of the University of Rochester (USA). The details of that stellar flyby, the closest documented so far, were presented in The Astrophysical Journal Letters.

Now two astronomers from the Complutense University of Madrid, the brothers Carlos and Raúl de la Fuente Marcos, together with the researcher Sverre J. Aarseth of the University of Cambridge (United Kingdom), have analyzed for the first time the nearly 340 objects of the solar system with hyperbolic orbits (very open V-shaped, not the typical elliptical), and in doing so they have detected that the trajectory of some of them is influenced by the passage of Scholz´s star.

It is likely that the close approach influenced a lot more objects, many of which might not have yet arrived in the inner solar system. Moreover, their computer models suggest that the star might have come closer to the Sun than 0.6 light years.

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School shooter in Maryland stopped by armed officer

9:08 am

A school shooter today in Maryland was stopped by armed officer before the shooter had killed anyone.

St. Mary Co. Sheriff Tim Cameron on shooting at Great Mills HS: shooting happened in hallway; shooter, a student, fired at a female student, another was student hit. Armed school resource ofc, a deputy, exchanged shots w/ shooter; shooter & female student in critical condition

The shooter has since died.

It is unclear if the shooter here was aiming to kill as many as possible, or was involved in personal conflict. Either way, the incident illustrates the wisdom of having armed protection available, either by teachers or police officers.

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Chinese competition in smallsat rocket industry forcing prices down

8:54 am

Capitalism in space: The price to launch smallsats is plummeting, partly because of competitive pressure coming from China.

During a panel discussion at the Satellite 2018 conference here March 12, executives of several launch providers said they expected small launchers under development or entering service in China, either by state-owned enterprises or private ventures, to sharply reduce launch prices in the coming years. “I think the Chinese are going to drive an order of magnitude reduction in launch costs, building satellites and operating satellites. That will happen in the next five years,” said Rich Pournelle, vice president of business development for NanoRacks, a company that offers rideshare launch services for smallsats, primarily from the International Space Station.

Pournelle said that there are already signs of price pressure on launches. “Cubesats that used to cost $350,000–400,000 to launch are now $250,000 and going down,” he said. “You’re seeing a tremendous pressure from Asia, especially, on the launch side.”

Others on the panel agreed. “I think prices will settle and start to go lower as the Chinese put more launchers on,” said Curt Blake, president of Spaceflight, which also provides rideshare launch services on a variety of vehicles. “That will put pressure on U.S. launch vehicles.”

The industry concern here is that the Chinese companies are not really private, and can be heavily subsidized by China so that they can offer lower prices than anyone else. They are therefore suggesting that the government should step in and act to protect them from this competition.

I say, the government should stay out. For one thing, U.S. law today prevents American companies from using Chinese launchers, and a vast majority of the launch business is going to come from the U.S. The U.S. smallsat launch industry will have plenty of work, and can very effectively deal with the Chinese competition without government help. Moreover, this Chinese competition will only serve to enliven the market, and bring about more innovation and lower prices. The last thing we need is the government stepping in to interfere with that healthy and free competition.

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Alaskan spaceport schedules first commercial launch

8:45 am

The spaceport in Kodiak, Alaska, has announced that its first commercial launch is now scheduled for mid-April.

The Coast Guard has notified mariners of the launch, which is scheduled for some time between April 6-13, the Kodiak Daily Mirror reported Monday.

Alaska Aerospace has launched 19 rockets in collaboration with government agencies including NASA, the U.S. Air Force and the Missile Defense Agency since the spaceport opened in 1998. But in recent years, the publicly owned corporation has partnered with commercial launch companies amid the growth of the private spaceflight industry. In preparation for the launch, berms are in place to protect the launch pad and surrounding facilities. A glass structure has been placed on top of a shipping container, which will serve as a mission control center.

Sources with knowledge of the industry have refused to name the company that will launch in April due to a non-disclosure agreement, the Daily Mirror reported. But the launch will not be from Vector Space Systems or Rocket Lab — two companies that have known contracts with Alaska Aerospace.

If not Rocket Lab or Vector, this suggests another smallsat company, such as Interorbital, Firefly, or Arca, or even a company I have not spotted up to now. If so, this will certainly heat up the competition in the smallsat rocket industry.

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Port of Los Angeles approves SpaceX portside construction site

10:22 pm

The Port of Los Angeles has granted SpaceX approval to begin construction of a booster construction and refurbishment facility on a large abandoned lot with direct ocean berthing access.

A request summary completed on March 6 details SpaceX’s proposal, laying out a bright future of rocket manufacturing for the abandoned 18-acre lot at Berth 240, one that might soon support “composite curing, cleaning, painting, and assembly [of commercial transportation vessels]” that “would need to be transported by water due to their size.

The article then speculates that this facility will be used to build SpaceX’s BFR. Maybe so, but my guess is that the facility is needed now for bringing reused Falcon 9 and Falcon Heavy boosters back after launch and prepping them for reuse.

While it is likely to take a fair amount of time to prepare the lot for the construction of a facility capable of manufacturing advanced composite rocket components, the wording in the Port documentation also suggests that SpaceX means to transfer its Falcon 9 recovery work to the new berth as soon as it’s available. Indeed, the comparatively massive space would give SpaceX far more room for recovery operations with the drone ship Just Read The Instructions (JRTI), and could potentially become a one-stop-shop for booster recovery and refurbishment. As of now, boosters recovered on the West Coast are transported to the Hawthorne factory for all refurbishment work, operations that themselves already require brief road stoppages to accommodate the sheer size of Falcon 9.

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On The Space Show Monday March 19 7 pm PDT

5:50 pm

Several recent stories regarding Trump’s space policy has prompted David Livingston to quickly schedule a Bob Zimmerman appearance on The Space Show for Monday, March 19, 7 pm (Pacific). The show will last at least ninety minutes. David especially wanted my analysis of Trump’s comments about the Falcon Heavy and SpaceX and how those comments have the big space contractors Boeing and Lockheed Martin quaking in their boots. Their fear and terror is further compounded by the present lack of a NASA administrator, which is made even worse by the announcement that the acting interim administrator is retiring at the end of March.

You can listen to the show live at the Space Show link. We are hoping that a number of my readers will call in with questions as well as their thoughts. The Space Show toll free number is 1 (866) 687-7223. David does not screen calls, though he expects those who call to have good questions or thoughts that will further the conversation in an entertaining way. And I don’t bite!

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New theory suggests Mars’ oceans formed earlier and intermittently

11:19 am

Scientists have proposed a new model for the existence of oceans on Mars’ northern plains that proposes they formed earlier, were shallower, were variable in size, and formed in conjunction with the eruptions that formed the planet’s giant volcanoes.

The proposal by UC Berkeley geophysicists links the existence of oceans early in Mars history to the rise of the solar system’s largest volcanic system, Tharsis, and highlights the key role played by global warming in allowing liquid water to exist on Mars. “Volcanoes may be important in creating the conditions for Mars to be wet,” said Michael Manga, a UC Berkeley professor of earth and planetary science and senior author of a paper appearing in Nature this week and posted online March 19.

…The new model proposes that the oceans formed before or at the same time as Mars’ largest volcanic feature, Tharsis, instead of after Tharsis formed 3.7 billion years ago. Because Tharsis was smaller at that time, it did not distort the planet as much as it did later, in particular the plains that cover most of the northern hemisphere and are the presumed ancient seabed. The absence of crustal deformation from Tharsis means the seas would have been shallower, holding about half the water of earlier estimates. “The assumption was that Tharsis formed quickly and early, rather than gradually, and that the oceans came later,” Manga said. “We’re saying that the oceans predate and accompany the lava outpourings that made Tharsis.”

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Witness tampering and intimidation by Imran Awan

9:21 am

A new report outlines the numerous examples where it appears Imran Awan, the Pakistani IT specialist hired by congressional Democrats to manage their computers and who used that position to steal government equipment and break into secure computers without permission, threatened potential witnesses against him with lawsuits and violence if they testified against him.

Here’s one example:

Soon after the House of Representatives found that Democratic IT aide Imran Awan and his family made “unauthorized access” to congressional data, Imran hurriedly vacated his house, renting it in February 2017 to a former Marine. Imran angrily told his new tenant, Andre Taggart, that he was homeless and to refuse any certified mail in Imran’s name, Taggart said. A lawyer contacted Taggart about some items Imran left behind in the house and threatened to sue if he didn’t return them, saying he’d accuse Taggart of theft, Taggart said. The equipment included Blackberries and “hard drives they look like they tried to destroy,” as well as laptops and “a lot of brand new expensive [printer] toner,” he said. Based on his military training, they appeared to Taggart to be government equipment, and he called the police.

The Capitol Police and FBI arrived to collect the computer equipment, and Taggart moved out of the house in May, he said. In late August, Taggart felt that there was enough distance between Imran and his family that it was safe to tell his story publicly.

He received a letter from days later Jesse Winograd, whose law firm Gowen Rhoades Winograd & Silva was hired by Imran to deal with the congressional matter. The letter demanded some $15,000, citing a laundry list of damages, including killing a tree in the yard. Taggart denies the charges and believes Awan may be trying to intimidate him.

Numerous other examples in the article include threats of violence and actual violence against witnesses. There is also ample evidence suggesting Awan is using blackmail against many Democratic Party representatives to keep them silent in the case.

Meanwhile, the judge in the case, a big Democrat supporter and opponent of Trump, has repeatedly delayed Awan’s trial.

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World’s largest jet engine makes first test flight

8:26 am

The world’s largest jet engine, built by GE Aviation for Boeing’s next generation wide body passenger jet, made its first test flight last week.

The GE9X is a monster compared to its predecessors. Due to the extensive use of composites in building the fan blades and the fan case, 3D-printed nozzles, new light- and heat-resistant ceramics, and reducing the number of fan blades from 22 to 16, GE was able to lighten the engine and expand its size so that its fan is now 134-inches (341 cm) across and the entire engine is as wide as a Boeing 737 fuselage. In addition, it can push 100,000 lb of thrust and is 10 percent more efficient than the GE90 engine used on the current generation of 777s.

The engine was attached to a 747 test plane for the flight, and the images at the link truly illustrate how large this engine is. The 747 still had its two outer normal engines attached, and the size difference is gob-smacking. When I first looked at the pictures I was convinced it was fake and that they had photoshopped this giant engine onto the 747. They didn’t.

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Scientists theorize that Oumuamua came from a binary star system

8:17 am

Based on statistics and computer modeling, some scientists believe that the interstellar object Oumuamau likely came from stellar binary system.

For the new study, published in the journal Monthly Notices of the Royal Astronomical Society, Jackson and his co-authors set about testing how efficient binary star systems are at ejecting objects. They also looked at how common these star systems are in the Galaxy. They found that rocky objects like ‘Oumuamua are far more likely to come from binary than single star systems. They were also able to determine that rocky objects are ejected from binary systems in comparable numbers to icy objects.

Their conclusion does make sense, though any good scientist would retain a gigantic sense of skepticism. While it is statistically reasonable to conclude that a majority of interstellar objects should come from binary systems, there is no guarantee that Oumuamua in particular did so. Even if the odds were one in a million, there is always that one, and the universe often seems prone to fooling us.

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