Tag: engineering

January 6, 2023 Quick space links

1:19 pm

Courtesy of Jay, BtB’s stringer. I am still under the weather, so this might be the last post of the day.

 

  • Anthony Zak’s predicts major additional cuts in Russia’s space program

    • This only confirms what I have been saying for about a decade, since Putin consolidated the entire space industry into a single government-controlled corporation and thus ended all competition. His war in the Ukraine has only underlined his poor judgment. These cuts also continue the downward budget spiral for Roscosmos that has been ongoing for about a decade.

 

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General Atomics wins Air Force contract to build technology test lunar satellite

10:35 am

General Atomics yesterday announced that it has been awarded an Air Force Research Laboratory (AFRL) contract to build a satellite to test a variety of technologies in near lunar space.

The AFRL Oracle spacecraft program is intended to demonstrate advanced techniques to detect and track objects in the region near the Moon that cannot be viewed optically from the Earth or from satellites in traditional orbits such as geosynchronous earth orbit (GEO). The anticipated launch date for the Oracle spacecraft is late 2025.

While this is good business for General Atomics, the company is not selling its product to the Air Force, but building what the Air Force wants, making the spacecraft government owned. This is how the space industry functioned in the United States for almost a half century after Apollo, generally accomplishing little for great cost. Much better in the long run if the military bought this kind of product from private companies, who developed it for profit and for sale not just to the military.

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Private lunar rover to fly on private lunar lander

10:24 am

Yaoki deployed from Nova-C
Yaoki deployed from Nova-C

The Japanese based robot company Dymon has now purchased payload space on Intuitive Machines second lunar lander, Nova-C, in order to fly its own lunar rover, dubbed Yaoki, to the Moon.

Yaoki is expected to be flown to the lunar south pole on board Intuitive Machines’ Nova-C lunar lander in the second half of 2023. After landing, Yaoki is expected to deploy from Nova-C to demonstrate Dymon’s lunar mobility technology designed by its Founder and Chief Executive Officer, Shin-ichiro Nakajima.

The agreement with Dymon leverages Intuitive Machines’ Lunar Access Services and Lunar Data Services business segments to land the Yaoki rover on the Moon and control it via secure lunar communications.

The main passenger on this mission is NASA, but Inituitive Machines is free to make money by selling payload space to others. The graphic, from the press release, is intriguing, as it does not show how the rover will be deployed.

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Impulse’s first demo space tug scheduled for launch

10:14 am

Impulse Space announced on January 4, 2023 that it has now scheduled the launch of its first demo space tug, Mira, for the fourth quarter of 2023.

Impulse Space said its LEO Express-1 mission, using a transfer vehicle it is developing called Mira, is manifested for launch on SpaceX’s Transporter-9 rideshare mission currently scheduled for launch in the fourth quarter of 2023. LEO Express-1 will carry a primary payload for an undisclosed customer.

Barry Matsumori, chief operating officer of Impulse Space, said in an interview that the mission can accommodate additional payloads, like cubesats. The mission profile is still being finalized, but he said the vehicle, after making some initial deployments, may raise its orbit, then lower it to demonstrate operations in what’s known as very low Earth orbit, around 300 kilometers.

After this demonstration flight the company has plans for additional flights in 2024. This tug will then join a growing fleet of companies offering this orbital transport capability to cubesats.

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Virgin Orbit’s launch from Cornwall finally scheduled for January 9th

9:54 am

The first orbital launch from the United Kingdom has finally been scheduled, with Virgin Orbit’s 747 taking off from an airport in Cornwall on January 9, 2023 and carrying its LauncherOne rocket with 9 satellites.

Monday’s mission opportunity has been purchased by the US National Reconnaissance Office and is being used to advance a number of satellite technologies of security and defence interest to both the American and British governments. But there are also civil applications being taken up on the flight – and a number of firsts, such as the first satellite built in Wales and the first satellite for the Sultanate of Oman.

The UK’s Civil Aviation Authority [CAA], which regulates commercial spaceflight in the UK, said on Thursday that all nine spacecraft on the manifest had now been licensed. Virgin and Spaceport Cornwall received their launch licences before Christmas.

The launch was originally planned for sometime in the summer, but delays in obtaining the launch permits from the CAA pushed it back a half year. That unexpected and unnecessary delay now threatens the very existence of Virgin Orbit, as the company could do no other launches as it waited and thus earned nothing.

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Virgin Orbit completes $37 million stock sale

3:18 pm

It appears that Virgin Orbit has just completed a $37 million sale of new common stock, valued at $0.0001 per share, and equal to about 10% of the company.

Hat tip to stringer Jay, who writes, “To me, it is like V.O. is printing money. They have already lost most of the value of the original stock, they are losing about $20 million a quarter, and they just raised $37M.”

Virgin Orbit had planned in 2022 about eight launches. It completed two, and then got blocked by the UK bureaucracy, completing no more launches for the rest of year while it waited months for permits to launch from Cornwall. During that time it could not launch its other customers because it only had one 747 in its fleet to launch its rocket.

No launches means no income. To keep the company afloat Branson has had his larger company Virgin Group transfer first $25 million and then another $20 million to Virgin Orbit. This stock sale appears to be another effort to keep Virgin Orbit above water.

The endless and unexpected delays getting permits to launch from Cornwall now suggests that some people in the UK government might not like Branson, and took this opportunity to sabotage him. Pure speculation I know, but not beyond the realm of possibility.

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The dry and dusty equatorial regions of Mars

1:50 pm

The dry cratered highlands of Mars
Click for full image.

Cool image time! The photo to the right, rotated, cropped, and reduced to post here, was taken on October 2, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows a cluster of craters filled with ripple dunes.

The color strip tells us something [pdf] about the surface materials here. The reddish-orange in the craters is thought to be dust. The greenish terrain above the craters is likely coarse rock or bedrock, covered with a veneer of dust.

There is no ice here, just dust that over time has become trapped in the craters and cannot escape. And though there is also dust on the surrounding terrain, there is not that much. The craters themselves are likely very ancient, based on their shape and the eroded condition of their rims.

» Read more

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Voyager signs deal with Airbus to build its private space station

8:58 am

Voyager Space, the division of Nanoracks that has a contract with NASA for building one of four private space stations, has now signed a deal with Airbus, which will provide Voyager additional technical support.

It appears this deal is going to give Europe access to at least one of those American stations, once ISS is gone.

“We are proud to partner with Airbus Defence and Space to bring Starlab to life. Our vision is to create the most accessible infrastructure in space to serve the scientific community,” said Dylan Taylor, Chairman and CEO of Voyager Space. “This partnership is unique in that it engages international partners in the Commercial Destinations Free-Flyer program. Working with Airbus we will expand Starlab’s ecosystem to serve the European Space Agency (ESA) and its member state space agencies to continue their microgravity research in LEO.”

Unlike ISS, where profit was not a motive, Voyager has to make money on its Starlab space station. If Europe wants in, it needs to provide Voyager something, and this deal is apparently part of that contribution. I also suspect that high level negotiations occurred within NASA, ESA, and Voyager to make this deal happen so that Europe would continue to have access to at least one of the American stations.

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Updates on India’s space effort

8:46 am

It appears that India’s effort in space is evolving rapidly, based on several news stories today.

First, the Indian space agency ISRO signed a deal with Microsoft, whereby the software giant will provide support to private Indian space start-ups.

As part of a memorandum of understanding that Microsoft has signed with the Indian Space Research Organization, the firm will also provide space tech startups with go-to-market support and help them become enterprise ready, it said.

Startups handpicked by ISRO will be onboarded to Microsoft for Startups Founders Hub platform, where they will receive free access to several tools and resources. These tools include help with building and scaling on Azure, as well as GitHub Enterprise, Visual Studio Enterprise, Microsoft 365 and Power BI and Dynamics 365. [emphasis mine]

The highlighted phrase indicates once again that there is an aggressive turf war going on in India about who will control the aerospace industry. Similar to the battles that occurred at NASA in the 00s and 10s, there are people within ISRO who do not wish to cede their power to an independent private industry, and are doing whatever they can to block the Modi government’s effort to create such an independent industry.

In the end, as long as Modi government stands firm, this effort will fail. Private companies will increasingly succeed, and that success will feed the transition from a government-run industry to an independent and competitive one.

In other stories from India:
» Read more

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Drainage out of a Martian crater

12:42 pm

Drainage out of a Martian crater
Click for full image.

Today’s cool image to the right, rotated, cropped, reduced, and sharpened to post here, not only gives us another example of a Martian geological feature that is unique to Mars and whose origins are not yet understood, it also shows what appears to have once been a lake-filled crater that over time drained out to the east through a gap.

This picture was taken on October 14, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). The inexplicable geology is called brain terrain, and it fills the floor of the crater on the picture’s left side. The rim shows a gap, from which a meandering channel continues downhill to the east. The lake inside the crater might not have been liquid water, but ice. The channel might not have been formed by flowing water, but by a glacial flow downhill.

What makes this glacial evidence especially interesting is that it is located in a very different part of the Martian mid-latitudes.
» Read more

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January 3, 2023 Quick space links

3:11 pm

Courtesy of BtB’s stringer, who trolls the web to make sure I don’t miss any important stories.

  • Astronaut Walt Cunningham has passed away

    • Cunningham only flew in space once, on Apollo 7, the first shakedown flight of the Apollo capsule in October 1968. The flight lasted ten days, had no technical problems at all, though all three astronauts caught colds. Its success paved the way for the Apollo 8 mission around the Moon two months later.

 

 

  • The trailer for the Russian sci-fi movie, The Challenge, that was partly filmed on ISS last year, has now been released

    • It is very clear that they got a lot of good footage when they were on ISS. It is a shame however that this trailer doesn’t have English subtitles, because I think it probably could make some money from American filmgoers.

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China releases first update on status of Yutu-2 since September

12:46 pm

Yutu-2's travel path through December 2022
Click for full image. The red flag marks the landing site.

China today released its first update since September on the status of its Yutu-2 rover on the far side of the Moon. The map on the right shows the rover’s travels through December 2022.

As of today the rover has traveled 4,774 feet total, and about 450 feet since September. The goal, as stated in April 2021, was to “move northwest toward the basalt distribution area located about 1.2 km away.” At the time the rover was only averaging about 100 feet travel per lunar day. According to these numbers, it picked up the pace in the past year, though it is unclear whether it has reached that goal.

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The soft icy Martian northern lowland plains

11:15 am

The soft icy Martian northern lowland plains
Click for full image.

In a cool image post last week, I noted that the near surface “ice sheets in the northern lowland plains are never … smooth, even if well protected.” The picture to the right, cropped, reduced, and sharpened to post here, provides an excellent example. It was taken on November 2, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

It is winter, and the sunlight is coming from the southwest, only 27 degrees above the horizon. The mound on the left is soft, while the depression on the upper right appears to have sand dune ripples sitting on top of a flat glacial mound. This depression may be an eroded crater (no upraised rim) or it could be a sink caused by the sublimation of the near surface ice.

Everywhere else the flat plains are stippled with small knobs.

The overview map below provides more context.
» Read more

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Largest volcanic eruption in years detected on Io

9:49 am

Using instruments on a ground-based telescope, one scientist based at the Planetary Science Institute (PSI) in Arizona has detected the largest volcanic eruption in years on the Jupiter moon Io.

PSI Senior Scientist [Jeff] Morgenthaler has been using IoIO, located near Benson, Arizona to monitor volcanic activity on Io, since 2017. The observations show some sort of outburst nearly every year, but the largest yet was seen in the fall of 2022. Io is the innermost of Jupiter’s four large moons and is the most volcanic body in the Solar System thanks to the tidal stresses it feels from Jupiter and two of its other large satellites, Europa and Ganymede.

IoIO uses a coronagraphic technique which dims the light coming from Jupiter to enable imaging of faint gases near the very bright planet. A brightening of two of these gases, sodium and ionized sulfur, began between July and September 2022 and lasted until December 2022. The ionized sulfur, which forms a donut-like structure that encircles Jupiter and is called the Io plasma torus, was curiously not nearly as bright in this outburst as previously seen. “This could be telling us something about the composition of the volcanic activity that produced the outburst or it could be telling us that the torus is more efficient at ridding itself of material when more material is thrown into it,” Morgenthaler said.

The material released by this eruption could impact Juno during future close approaches of Jupiter.

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SpaceX raises another $750 million in private investment capital

9:36 am

SpaceX has just completed another round of fund-raising, gaining another $750 million in private investment capital.

This additional money now means that SpaceX has raised about $10 billion in private money, most of which is being used for the development of Starship and Superheavy. When we add the $4 billion SpaceX will get from NASA for Starship, the company now has $14 billion to build this new rocket.

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Rocketry went BOOM! in 2022, but in a good way

12:44 pm

In my 2021 annual report on the global launch industry, I noted that while 2021 was a banner year for the global launch industry:

Not all is sweetness and light of course. Competition and freedom always includes risk. Some of these new companies will certainly fail. The demand for launch services might not be enough to sustain them all. And factors outside the control of anyone, such as war and further panics like the Wuhan panic, could shut them all down.

In 2022 the launch industry not only topped 2021, setting a new record for successful launches in a single year, the industry was reshaped and changed by the very factors I warned about one year ago. The Russian invasion of the Ukraine resulted in Russia losing its one remaining satellite customer from the west, OneWeb, while the challenges of rocketry caused one already successful launch company, Astra, to suspend its launch services in order to develop a more competitive rocket.

Nonetheless, 2022 remained the most successful year ever in rocketry, smashing the record for successful launches in a single year, set the previous year, by more than 33%. The graph below illustrates well the unprecedented success of 2022.
» Read more

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Hakuto-R successfully completes second mid-course correction

9:36 am

Lunar map showing Hakuto-R's landing spot
Hakuto-R’s planned landing site is in Atlas Crater.

According to Ispace, the private lunar lander company based in Japan, its Hakuto-R lander has now successfully completed second mid-course correction, and is functioning as expected on its way to the Moon.

The maneuver was carried out shortly after midnight on Jan. 2, 2023 (Japan Standard Time) and operations were managed from ispace’s mission control center located in Nihonbashi, Tokyo. This orbital control maneuver is the second maneuver to occur while the lander has been traveling to the moon. The first orbital control maneuver was completed on December 15, 2022. The second maneuver was carried out at a greater distance from Earth and lasted for a longer period than the first maneuver, verifying the company’s capability to carry out orbital maneuvers under various conditions.

As of Jan. 2, 2023, the lander has traveled approximately 1.24 million kilometers from the Earth and is scheduled to be at its farthest point of approximately 1.4 million km from the Earth by Jan. 20, 2023. Once the lander reaches its farthest point from Earth, a third orbital control maneuver may be performed, depending on its navigational status.

While Hakuto-R carries a number of commercial payloads — including Rashid, the first lunar rover built by the United Arab Emirates (UAE) — its primary goal is engineering. Ispace is using this mission to demonstrate its ability as a company to do this, in anticipation of later commercial planetary missions.

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Sunspot update: The most sunspots since 2014

9:26 am

Time for my monthly sunspot update, based on NOAA’s monthly graph that tracks the number of sunspots on the Sun’s Earth-facing hemisphere. The newest graph, with December’s numbers added to the timeline, is below. As always, I have added some additional details to provide context.

In December the half-year pause in the ramp up to solar maximum ceased, with the Sun seeing the most sunspots since September 2014. This high activity far exceeded the predicted sunspot count for December 2023, almost doubling it. In fact, December’s sunspot count almost equaled the predicted peak for the upcoming solar maximum, which is not supposed to happen until sometime in 2025.

» Read more

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A spray of Martian hollows

11:42 am

A spray of Martian sinks
Click for full image.

Cool image time! The photo to the right, rotated, cropped, reduced, and sharpened to post here, was taken on October 12. 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). Dubbed simply as a a “terrain sample” by the science team, the picture was not taken as part of any specific research project, but instead to fill a gap in the orbiter’s shooting schedule so as to maintain the camera’s proper temperature. When MRO’s science team does this, they try to pick something in the area below that might be interesting. Sometimes they succeed, but often the features in the picture are nondescript.

The white line delineates the rim of a faint and very eroded small crater. Are the depressions that are mostly concentrated just to its south and east sinks or past impact craters? I haven’t the faintest idea. The overview map below helps to answer this question, but only partly.
» Read more

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Philippines issues warning about Chinese rocket debris from launch

9:17 am

Flight path of Long March 3B
Click for full resolution image.

UPDATE: A tweet from China shows that the strap-on boosters of this rocket crashed near homes in China, though no one was hurt.

Original post:
—————–
The Philippine government issued a statement yesterday warning the public about possible debris from the December 29th launch by China of its Long March 3B rocket.

The Philippine Space Agency (PhilSA) is recommending precautionary measures related to expected unburned debris from the Long March 3B rocket scheduled for launch today between 12:33 PM and 01:10 PM Philippine time from the Xichang Satellite Launch Center in Xichang, Sichuan Province, China. Upon confirmation of planned launch dates, PhilSA immediately issued an advisory to all relevant government agencies on the estimated drop zone area and proposed the issuance of appropriate warnings on air and marine access.

Based on the Notice to Airmen (NOTAM) issued by the Civil Aviation Administration of China (CAAC) to the Civil Aviation Authority of the Philippines (CAAP), expected unburned debris, such as the rocket boosters and payload fairing, is projected to fall within a drop zone area located within the vicinity of Recto bank, approximately 137 kilometers from Ayungin Shoal and 200 kilometers from Quezon, Palawan. The unburned debris is designed to be discarded as the rocket enters outer space. While not projected to fall on land features or inhabited areas within the Philippine territory, falling debris poses danger and potential risk to ships, aircraft, fishing boats, and other vessels that will pass through the drop zone.

Though the drop zone avoided inhabited areas, it included regions where fisherman worked, and the flight path still flew over inhabited areas. The risk was extremely low, but it appears China also made no effort prior to launch to coordinate this situation with other governments, such as the Philippines. Its warning apparently arrived just before launch. Thus, there was risk that Filipino fisherman were in the drop zone at launch.

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South Korea test flies a solid-fueled missile

9:00 am

South Korea has successfully completed the second test flight of a solid-fueled missile.

The test came after North Korea claimed earlier this month to have staged a test of a “high-thrust, solid-fuel” rocket motor to develop a “new-type” strategic weapon system.

…In March, the state-run Agency for Defense Development carried out the first test of an indigenous solid-fuel space rocket at a testing site in Taean, 150 kilometers southwest of Seoul, to confirm its capabilities.

The rocket is designed to put a small satellite into a low Earth orbit for surveillance operations. Compared with liquid-fuel space vehicles, solid-fuel ones are known to be usually simpler and more cost-effective to launch.

South Korea might claim this rocket is intended for launching smallsats, but its main purpose almost certainly is as a military missile to counter the missile program of North Korea that has accelerated since Joe Biden became president.

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SpaceX successfully launches Israeli imaging satellite

12:53 am

SpaceX today successfully launched an Israeli Earth-observation satellite, using its Falcon 9 rocket.

The first stage successfully completed its eleventh flight, touching down softly at SpaceX’s facility at Vandenberg Space Force Base.

This launch completes SpaceX’s 2022 launch year, with a record 61 launches, one more than predicted by the company earlier in the year, and the most ever by a privately owned company.

The leaders in the 2022 launch race:

62 China
61 SpaceX
21 Russia
9 Rocket Lab
8 ULA

The U.S. now leads China 85 to 62, while trailing the rest of the entire world combined 94 to 85. The 85 launches for the U.S. is a new record for a single year, smashing the record of 70 launches set in 1966.

On Monday I will publish my annual full roundup of the state of global launch industry, based on the 2022 numbers.

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A hint at Mars’ past climate cycles

11:16 am

Terraced glaciers in Martian crater
Click for full image.

Cool image time! The photo to the right, cropped to post here, was taken on October 28, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the scientists label as a “layered feature” inside a small 4,500-foot-wide crater.

Located at 36 degrees north latitude, we are likely looking at glacial ice layers inside this crater, with each layer probably marking a different Martian climate cycle. The terraces suggest that during each growth cycle the glaciers grew less, meaning that less snow fell with each subsequent cycle. This in turn suggests a total loss of global water over time on Mars.

The overview map below gives us the wider context.
» Read more

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China to build giant ground-based optical telescope

9:45 am

China has announced its plan to build ground-based multi-segmented optical telescope, similar in design to the 10-meter Keck Telescope in Hawaii.

Peking University wants to build the largest optical telescope in Asia and close the gap in astronomy capabilities with the rest of the world.

The project aims to create an initial telescope with an aperture of 19.7 feet (6 meters) by 2024; the mirror will be expanded to 26.2 feet (8 m) by 2030. The project, which in English is called the Expanding Aperture Segmented Telescope (EAST), is being led by Peking University.

Like Keck, the primary mirror would be made of smaller segments, fitted together to create the larger mirror. While not as large as Keck, EAST would be among the largest in the world.

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China’s Long March 3B rocket launches “experimental satellite”

9:20 am

China today successfully used its Long March 3B rocket to launch from an interior spaceport what its state-run press labeled an “experimental satellite.”

No word on where the rocket’s strap-on side boosters or first stage crashed within China.

The leaders in the 2022 launch race:

62 China
60 SpaceX
21 Russia
9 Rocket Lab
8 ULA

The U.S. still leads China 84 to 62 in the national rankings, but trails the entire world combined 94 to 84.

This launch cements for China the top spot in launches over SpaceX, since SpaceX only has one more launch planned in 2022, scheduled for just before midnight tonight.

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Lex Fridman – Playing Guitar in a Self-Driving Car

6:01 pm

An evening pause: The guitar playing is great, but if this is supposed to be a demonstration of the abilities of self-driving cars, to me it is a utter failure. The drive was on a test track, with no other cars. The car itself was probably never going faster than 25 miles per hour.

In fact, if anything this proves the impracticality of self-driving cars. Such technology might work in a completely controlled environment, but as soon as you add any random human element, it can’t work. Thus our options: we continue to drive ourselves, or we give up our freedom to drive so that all vehicles can be autonomous.

But as I say, the guitar playing is great.

Hat tip Wayne Devette.

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A “What the heck?” glacier image on Mars

5:36 pm

Glacial material on Mars
Click for full image.

Sometimes a cool image goes from bafflement to obvious as you zoom into it. The cool image to the right, cropped to post here, does the opposite. It was taken on October 11, 2022 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). I have purposely cropped it at full resolution, so that its eroded glacier nature is most obvious.

The cracks and hollows are likely caused by the sublimation of the near surface underground ice, breaking upward so that the protective surface layer of debris and dust collapses at some points, and cracks at others.

The overview map below further confirms the likelihood that we are looking at glacial features, but when we also zoom out from this close-up we discover things are not so easily explained.
» Read more

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Using reflected light from Jupiter to photograph Ganymede’s night side

12:15 pm

Ganymede as seen in the reflected light of Jupiter
Click for full image.

During Juno’s June 7, 2021 close fly-by of Ganymede, scientists used its instruments to obtain the first good image of a part of this Jupiter moon. What made the achievement especially amazing was that the area photographed was only lit by the reflected light from Jupiter, the equivalent of its “earthshine.” From the paper’s abstract:

On 7 June 2021, the Juno spacecraft flew within about 1,000 km of the surface of Jupiter’s largest moon, Ganymede. The Mission used their sensitive navigation camera to photograph the moon’s dark side where it was lit only by scattered sunlight from Jupiter. This new imaging approach revealed multiple surface features, including a patchwork of different surface textures (such as grooved terrain), several craters, and ejecta deposits. These features had not been visible in images collected by previous spacecraft.

The picture to the right is from figure 2 of the paper, cropped and reduced to post here. It shows a region on Ganymede that in the earlier images had shown few details because the lighting was poor and thus features were not easily discerned (as can be seen by the inset in the lower right). In the new picture, the only light was reflected from Jupiter, and its low angle brings out the surface topography.

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Russian investigators conclude leak on Soyuz caused by external impact

9:20 am

ISS as of November 28, 2022
ISS after November 28, 2022 docking of unmanned Dragon freighter.
MS-22 is the Soyuz capsule that is leaking.

The Russian investigators yesterday concluded that the coolant leak on the Soyuz capsule docked to ISS was caused by an external impact, either by a meteroid or a small piece of space junk.

A decision on whether this capsule is still usable for manned flight will be made sometime in January. If not, Russia will move up the launch of the next Soyuz to ISS one month from March to February, but launch it empty. If so, managers will leave the schedule as is.

If the engineers determine the capsule is not flightworthy, it will mean however that until February, ISS is short one lifeboat. At present there are two Dragon capsules docked to ISS, one manned and one cargo. Both return to Earth with a habitable interior, but the cargo capsule is not intended for manned flight. In an emergency however it might be possible to use it.

This situation suggests that NASA should pay to get SpaceX to upgrade the cargo Dragons so that they could always be used as an emergency lifeboat.

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