Category: Behind The Black

1st water vapor in Ganymede’s atmosphere, detected using data from Hubble

9:06 am

Using Hubble data, astronomers have detected the first evidence of water vapor in the atmosphere of Jupiter’s largest moon, Ganymede.

Though larger than the blistering planet Mercury, the Jovian moon Ganymede is no place to go sunbathing. Located ½-billion miles from the Sun, the water ice on its surface is frozen solid in frigid temperatures as low as minus 300 degrees Fahrenheit. This makes the ice as hard as rock. Still, a rain of charged particles from the Sun is enough to turn the ice into water vapor at high noon on Ganymede.

This is the first time such evidence has been found, courtesy of the Hubble Space Telescope’s spectroscopic observations of aurora on Ganymede spanning two decades. The auroras are used to trace the presence of oxygen, which then is linked to the presence of water molecules sputtering off the surface. Ganymede has a deep ocean located an estimated 100 miles below the surface. That’s too deep for water vapor to be leaking out.

This detection has a margin of uncertainty, but it provides a baseline for the up close observations planned for Europe’s JUICE orbiter, set to launch in ’22 and arrive in Jupiter orbit in ’29. JUICE’s study focus will be the three Galilean moons that appear to have lots of ice, Ganymede, Calisto, and Europa.

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Russians detach Pirs module in anticipation of Nauka arrival to ISS

8:48 am

With the engine problems of Russia’s new ISS module Nauka apparently resolved sufficiently for its rendezvous and docking expected on on July 29th, Russian astronauts today undocked the 20-year-old Pirs module, which then used its engines so that it safely burned up over the Pacific Ocean.

The article provides a nice history of Pirs, which was originally intended for Russia’s Mir-2 station, never built after the fall of the Soviet Union.

Pirs, meaning “pier,” traces its origins back to the Mir-2 space station — which was itself a Soviet project that’s design began in 1976. Mir-2’s long and troubled history would eventually find it in the early 1990s where major design changes to launch its various modules via the Buran space shuttle were underway.

Following the collapse of the Soviet Union in December 1991, Mir-2 emerged the following year as a four-module station — including a Docking Module, which would become Pirs. In 1993, Mir-2 officially merged with the long-delayed NASA/European/Japanese/Canadian space station Freedom project to become the building blocks of the International Space Station.

The module, which provided the Russian half of ISS needed extra docking ports, was originally expected to be replaced after about five years with a larger module, but this was never built.

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Deleted

8:39 am

This post incorrectly reported a Chinese launch as occurring today when it had actually occurred (and was reported previously. I have therefore deleted it. Sorry about the error.

The leaders in the 2021 launch thus remain as follows:

23 China
20 SpaceX
12 Russia
3 Northrop Grumman

The U.S. still leads China 29 to 24 in the national rankings.

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Update on Ingenuity’s 10th flight and Perseverance’s first sample drilling

3:54 pm

Ingenuity landing at end of 10th flight

The news coming from the Perseverance and Ingeniuty science teams has been sparse this past weekend, even though Perseverance had begun drilling its first core sample that it will stored for pickup by a later unmanned robot, and Ingenuity had attempted its 10th and most challenging flight yet.

We do have images however, and the two to the right give us hints about what has happened.

First, the top picture on the right was taken by Ingenuity’s navigation camera just prior to landing. The camera looks straight down and is used by the helicopter to adjust its flight. The dark area is the helicopter’s shadow. Based on this picture and the four preceding images (taken over an eleven second period), it appears the helicopter was landing safely. No other images have yet been downloaded, nor has the Ingenuity team announced any results, so we do not yet know if the flight proceeded as planned.

UPDATE: The flight was a success, as per this JPL announcement:

With the #MarsHelicopter’s #flight success today, we crossed its 1-mile total distance flown to date. It targeted an area called “Raised Ridges,” named for its #geographic features. Flight 10 is #Ingenuity’s most complex flight profile yet, with 10 distinct waypoints and a new #record height of 40 feet (12 meters).

Drill and core sample in the ground

The second image, taken by Perseverance’s left navigation camera and cropped and reduced to post here, is more puzzling. It shows what appears to be the core sample still in the ground after drilling. While this could be entirely as planned, it seems very surprising. Most of what I can find online describing the operation for obtaining these samples implies that the robot arm would drill the hole, and then retract the sample immediately to place it in storage. Nothing suggests the arm would be retracted with the sample still in the ground.

I think however the odds of this picture revealing a problem are low. This JPL press release from February 2021 implies vaguely that the core sample will be released in this manner before retraction. After the core sample, with bit, is separated from the arm, the release suggests they will lift the arm away to inspect the drilling process, then return the arm to retract the core sample for storage. This does make some sense, though grabbing that sample again will be quite challenging.

If this was not supposed to happen as described, then there is a problem that must be resolved. I expect more details in the next day or so to clarify this situation.

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Ingenuity’s next flight set for today

9:00 am

Flight plan for Ingenuity's 10th flight
Click for full image.

Though circumstances can obviously change, the Ingenuity/Perseverance science teams have scheduled Ingenuity’s 10th Martian flight for sometime later today, with a flight plan, shown to the right, that is even more ambitious.

Flight 10 will allow us to reap the benefits of our previous flight. Scheduled for no earlier than this Saturday (July 24), Flight 10 will target an area called the “Raised Ridges” (RR), named for the geographic features that start approximately 164 feet (50 meters) south-by-southwest of our current location. We will be imaging Raised Ridges because it’s an area that Perseverance scientists find intriguing and are considering visiting sometime in the future.

From navigation and performance perspectives, Flight 10 will be our most complex flight to date, with 10 distinct waypoints and a nominal altitude of 40 feet (12 meters). It begins with Ingenuity taking off from its sixth airfield and climbing to the new record height. It will then head south-by-southwest about 165 feet (50 meters), where upon hitting our second waypoint, take our first Return to Earth (RTE) camera image of the Raised Ridges, looking south. Next, we’ll translate sideways to waypoint 3 and take our next RTE image – again looking south at Raised Ridges.

Imagery experts at JPL hope to combine the overlapping data from these two images to generate one stereo image. Flying farther to the west, we’ll try for another stereo pair of images (waypoints 4 and 5), then head northwest for two more sets of stereo pairs at waypoints 6 and 7 as well as 8 and 9. Then, Ingenuity will turn northeast, landing at its seventh airfield – about 310 feet (95 meters) west of airfield 6. Total time in the air is expected to be about 165 second.

Unlike the previous flights, this one will involve several turns while in the air. The engineers are definitely pushing the envelope with each flight, thus not only gathering scientific data about Jezero Crater but also advancing their engineering knowledge on the art of robotic flying on Mars.

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The Oort Cloud: what little is known

5:47 pm

Link here. This is one of the best articles on the theorized Oort Cloud, in that right off the bat the author recognizes this important fact:

We know so little about it that its very existence is theoretical — the material that makes up this cloud has never been glimpsed by even our most powerful telescopes, except when some of it breaks free.

The cloud’s existence is extrapolated from the arrival of long period comets, and seems to make sense. Yet, without any direct observations it remains a theory only, and an unproven one at that.

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SpaceX wins contract to launch Europa Clipper to Jupiter

5:41 pm

Capitalism in space: NASA today awarded SpaceX a $178 million contract to use its Falcon Heavy rocket to launch Europa Clipper to Jupiter.

If all goes according to plan, Clipper will lift off in October 2024 from NASA’s Kennedy Space Center in Florida and arrive in orbit around Jupiter in April 2030. The probe will then study Europa in depth during nearly 50 close flybys of the moon over the course of about four Earth years, mission team members have said.

The award is not really a surprise. Falcon Heavy is really the only operational rocket with the power capable of launching this mission. Because for years Congress had mandated Europa Clipper be launched on SLS, it was designed with more mass than normal for such planetary missions. Delays in the SLS program however finally forced Congress to relax that mandate, but that left NASA with a payload too heavy for all operational rockets except Falcon Heavy, and even that requires this six year flight, with flybys of the Earth and Mars to get it to Jupiter.

The price for the launch is significantly greater than SpaceX normally charges for its Falcon Heavy, but since it was the only game in town, I suspect SpaceX drove a hard bargain.

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Ice, lava, quakes, and faults, all in one Martian image

1:04 pm

A lot of geology in one picture
Click for full image.

Cool image time! The photo to the right, rotated, cropped, and reduced to post here, was taken by the high resolution camera on Mars Reconnaissance Orbiter (MRO) on April 25, 2021. It grabbed my attention because it possibly captures a whole range of Martian geological processes, all in one place, including evidence of quakes, of lava, of faults, and possibly of glaciers.

First, ignore the black rectangle, which is merely a small section of lost data.

The picture itself shows a wide north-south fissure, as indicated by the distinct western cliff and the fainter and less pronounced eastern cliff. This fissure, likely formed along a fault, was created when the crust was pushed and stretched upward by the pressure of underground volcanic magma, part of the long series of eruptions that formed the many similar and parallel north-south fissures south of the shield volcano Alba Mons.

The overview map below illustrates this fissure’s relationship with Alba Mons.
» Read more

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Today’s blacklisted American: Democrats introduce Senate bill demanding companies censor social media

11:54 am

Democrats: No soapbox free speech allowed
Democrats: No soapbox allowed! Photo: GeorgeLouis

Blacklists are back and the Democrats got ’em! Two Democrats, Senator Amy Klobuchar (D-Minnesota) and Ben Ray Lujan (D-New Mexico), yesterday proposed a new law that would force social media companies like Google, Facebook, and Twitter to immediately remove any posts on their platforms that includes medical information those Democrats disagree with.

If the companies do not do so, they will be held liable for those posts.

As has become typical of Democrats, they label any information they disagree with as “misinformation.” To make sure their definition is sustained, their bill would have the federal government determine what is correct and not correct. That definition would then be used to justify silencing any other opinions.

Such a law would essentially repeal the First Amendment of the Constitution. Free speech will be banned. Only government-approved speech in connection with health will be allowed. If such a law was upheld by the courts (a very distinct possibility in today’s legal culture), it could quickly be expanded to cover all speech on any subject.

There is some irony in this Democratic Party proposal. » Read more

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Nauka issues apparently resolved?

10:46 am

According to a press release for Roscosmos, engineers have successfully fired the engines on Russia’s new large module for ISS, dubbed Nauka, and the module is now on course for rendezvous with the space station.

On Thursday, July 22, 2021 the Nauka Multipurpose Module Flight Control Group specialists at Moscow Mission Control Center conducted two correction maneuvers of the module that had launched to the International Space Station the previous day.

The first maneuver took place at 15:07 UTC with the module engines burn for 17.23 seconds giving an impulse of 1 m/sec. The second burn for 250.04 seconds took place at 17:19 UTC with an impulse of 14.59 m/sec.

No details were released explaining why the first course correction engine burn did not happen as scheduled.

UPDATE: I have added a question mark to the headline because there indications from a variety of sources, all unconfirmed, that the problems might still persist. We shall find out in the next two days.

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