Real Engineering
Published 11 Mar 2023
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June 18, 2023
Don’t Drop your Tools in Space
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August 2, 2018
Books on the ISS
No, that’s not books about the International Space Station, but physical books on the ISS:
The International Space Station is featured in this image photographed by an STS-132 crew member on board the Space Shuttle Atlantis after the station and shuttle began their post-undocking relative separation. Undocking of the two spacecraft occurred at 10:22 CDT on 23 May 2010, ending a seven-day stay that saw the addition of a new station module, Rassvet, replacement of batteries and resupply of the orbiting outpost.
Via Wikimedia Commons
The astronauts on the International Space Station are obviously busy people, but even busy people need some time to relax and unwind. In addition to a well-stocked film library (particularly strong on movies with a space theme, including 2001: A Space Odyssey and Gravity), there are also plenty of books in their informal library.
Some are brought up by the astronauts – Susan Helms was allowed ten paperbacks and chose Gone With the Wind, Vanity Fair and War and Peace in her carryon. Others come with space tourists such as billionaire businessman Charles Simonyi, who brought Faust and Robert Heinlein’s The Moon is a Harsh Mistress.
Authors whose works appear several times in the list include Daniel J. Boorstin (3 books), Terry Brooks (5), Lois McMaster Bujold (11), John Le Carré (3), and David Weber (13).
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October 2, 2015
Something to worry about – chances of a Kessler cascade
If you’re the worrying type, Charles Stross has a bit more for you to fit into your nightmares:
Today, the commercial exploitation of outer space appears to be a growth area. Barely a week goes by without a satellite launch somewhere on the planet. SpaceX has a gigantic order book and a contract to ferry astronauts to the ISS, probably starting in 2018; United Launch Alliance have a similar manned space taxi under development, and there are multiple competing projects under way to fill low earth orbit with constellations of hundreds of small data relay satellites to bring internet connectivity to the entire planet. For the first time since the 1960s it’s beginning to look as if human activity beyond low earth orbit is a distinct possibility within the next decade.
But there’s a fly in the ointment.
Kessler Syndrome, or collisional cascading, is a nightmare scenario for space activity. Proposed by NASA scientist Donald Kessler in 1978, it proposes that at a certain critical density, orbiting debris shed by satellites and launch vehicles will begin to impact on and shatter other satellites, producing a cascade of more debris, so that the probability of any given satellite being hit rises, leading to a chain reaction that effectively renders access to low earth orbit unacceptably hazardous.
This isn’t just fantasy. There are an estimated 300,000 pieces of debris already in orbit; a satellite is destroyed every year by an impact event. Even a fleck of shed paint a tenth of a millimeter across carries as much kinetic energy as a rifle bullet when it’s traveling at orbital velocity, and the majority of this crud is clustered in low orbit, with a secondary belt of bits in geosychronous orbit as well. The ISS carries patch kits in case of a micro-particle impact and periodically has to expend fuel to dodge dead satellites drifting into its orbit; on occasion the US space shuttles suffered windscreen impacts that necessitated ground repairs.
If a Kessler cascade erupts in low earth orbit, launching new satellites or manned spacecraft will become very hazardous, equivalent to running across a field under beaten fire from a machine gun with an infinite ammunition supply. Sooner or later you’ll be hit. And the debris stays in orbit for a very long time, typically years to decades (centuries or millennia for the particles in higher orbits).
How about a kickstarter campaign for laser-equipped orbit-cleaning satellites? Sweep up our orbital trash before it becomes a huge problem. If you’ve read Neal Stephenson’s Seveneves, you’ve already got the image of a really extreme result of too much space junk (in the case of the novel, it was shattered pieces of the moon creating the Kessler cascade).
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July 2, 2015
A bad day for the space program
In National Review, Taylor Dinerman discusses the bad news from SpaceX and what it means for the space program:
June 28 was Elon Musk’s 44th birthday, and he had hoped to celebrate with a successful launch of the SpaceX Falcon 9 rocket. It would be carrying a Dragon capsule full of supplies for the International Space Station (ISS), under the Commercial Orbital Transportation Services contract he signed with NASA back in 2006.
Musk had also hoped that once the Dragon capsule was well on its way to the space station, the Falcon’s first stage would return to Earth’s surface for a powered landing on a barge off the coast of Florida. A successful flight would have been a major step toward building a reusable launch vehicle, which could radically reduce the cost of getting payloads into orbit.
Instead, the Falcon 9 exploded a few minutes after leaving the launch pad.
It has been a rough time recently for ISS logistics. In October an Antares rocket launched from Virginia by Orbital Sciences blew up, and in April a Russian Progress supply capsule was lost when its Soyuz launcher malfunctioned. NASA says that there are enough supplies onboard the ISS to last until October. If this summer’s planned launch of a Japanese HTV supply capsule goes wrong, things could get dicey.
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November 21, 2014
Marsha Ivins talks about the reality of working in space
In Wired, former astronaut Marsha Ivins talks to Caitlin Roper about what it’s really like to work in space:
Everyone imagines that when you’re sitting on the launchpad atop 7 million pounds of explosive rocket fuel, you’re nervous and worried; but the truth is, there isn’t much to do for those two hours after you climb into the shuttle. Many astronauts just take a nap. You’re strapped in like a sack of potatoes while the system goes through thousands of prelaunch checks. Occasionally you have to wake up and say “Roger” or “Loud and clear.” But the launch itself is a whole other thing — from the pad to orbit in 8.5 minutes, accelerating the entire time until you reach the orbital velocity of 17,500 mph. That is a ride.
It turns out that once you’re actually in orbit, zero-g has some upsides. Without gravity, bodily fluids move toward your head. It’s a great face-lift. Your stomach gets flat. You feel long, because you grow an inch or two. (I thought, “Oh cool, I’ll be tall,” but of course everybody else was taller too.)
But zero-g also has some disadvantages. As that fluid shifts north, you get an enormous headache. Your body compensates and loses about a liter of fluid in the first couple of days — you essentially pee the headache away. And a lot of people get nauseated. The way to feel better is to “lose up,” to convince your visual system that “up” is wherever you point your head and “down” is where your feet are. When you can do that, and go headfirst or earlobe-first wherever you want, then you’re getting adapted to zero-g. On each flight this adaptation happens more quickly — your body remembers having been in space. But it can take a few days before your stomach finally settles down and says, “OK, what’s for lunch?”
I didn’t eat much on any of my flights. I don’t have a big appetite even on Earth, but between the lack of gravity and the shifting fluids, things can taste different in space. I’d bring great chocolate with me and it would taste like wax — it was very disappointing. But you don’t go to space for the gourmet dining. There’s no way to cook, on the shuttle or on the ISS. Space food is already cooked and then either freeze-dried and vacuum-packed — so you add water and put it in the oven to warm up — or it’s thermo-stabilized, like a military MRE. With no refrigerator on board, fresh food won’t keep. So on the shuttle we’d have to eat anything fresh — usually fruit like apples, oranges, and grapefruit — early in the mission.
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September 17, 2014
SpaceX and Boeing get NASA funding for 2017 deadline
In Ars Technica, John Timmer reports on the NASA decision to fund two of the three competitors for manned launches to the ISS:
Today, NASA administrator Charles Bolden announced that there were two winners in the campaign to become the first company to launch astronauts to low-Earth orbit: Boeing and SpaceX. The two will receive contracts that total $6.8 billion dollars to have hardware ready for a 2017 certification — a process that will include one crewed flight to the International Space Station (ISS).
In announcing the plan, Bolden quoted President Obama in saying, “The greatest nation on earth should not be dependent on any other nation to get to space.” And he promoted the commercial crew program as a clear way of ending a reliance on Russian launch vehicles to get to the ISS. But Bolden and others at the press conference were also looking beyond that; several speakers, including Kennedy Space Center Director Bob Cabana and astronaut Mike Fincke, mentioned that the ultimate goal is Mars.
To that end, Bolden emphasized that NASA is still doing its own vehicle and rocket development. The Orion crew capsule, intended to be suitable for missions deeper into the Solar System, recently underwent a splashdown test in the Pacific. Its first test flight aboard a Delta IV rocket is scheduled for this December. Work on the Space Launch System, a heavy lift vehicle that can transport the additional hardware needed for deep space missions, was also mentioned.
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May 14, 2014
Russia, the United States, and the ISS – an opening for SpaceX
Motherboard‘s Jason Koebler says that Russia’s threat to ban companies from shipping rocket engines to the US represents a great chance for SpaceX to cash in:
Russia just announced plans to shut down the International Space Station in 2020, and prohibited companies in the country from selling engines to Lockheed Martin and Boeing for military launch purposes. If this is more than just posturing, there’s at least one takeaway: SpaceX is about to get paid.
It was just a month ago that NASA Administrator Charles Bolden said that Russia would never ban the United States from the ISS, and that his “contingency plan” for getting astronauts to and from the ISS was to continue working with Russia as normal until an American company is ready to fly manned flights to the ISS in roughly three years.
[…]
And that brings us to SpaceX. The company stands to gain greatly from both bits of news Rogozin announced today.
The company recently won (and then subsequently lost) an injunction to force the United States Air Force to compete for military satellite launch contracts. If Boeing and Lockheed Martin are blocked from buying Russian engines for their Atlas V and Delta IV from the other side (it’s worth noting that both countries have threatened to ban the companies from buying Russian engines), the Air Force once again has incentive to look at SpaceX as a legitimate option to launch military satellites.
The Air Force’s contract with the Boeing-Lockheed cooperative United Launch Alliance is worth roughly $70 billion through 2030 — SpaceX could potentially swoop in and take some of that amid the uncertainty.
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May 1, 2014
SpaceX and the successful re-entry experiment
Amanda Wills talks about the most recent SpaceX achievement:
When SpaceX launched its Dragon supply mission to the International Space Station on April 18, it tried something revolutionary after the spacecraft was safely in orbit.
Behind the scenes, CEO Elon Musk and his team had been testing the reusability of this rocket. On that Friday, the team returned part of it to Earth for the first time in history. Once Dragon was in space, the first stage separated and re-entered Earth’s atmosphere. As the helium-filled rocket slowed, it extended four 25-foot-long landing legs and used its thrusters to briefly hover over the Atlantic Ocean before plopping down ever so gently onto its surface.
Musk and his team pulled it off — a huge feat considering that the chance of success was only around 30% to 40%. The SpaceX team recovered the raw video from the camera that was on board Falcon 9, and software engineers have spent the last week trying to repair the footage, which was taken just before splashdown.
[…]
The team was able to bring back the first stage. The rocket was clearly vertical — an important detail in testing reusable rockets — and the soft landing was successful. However, the weather wasn’t cooperative that day and the stage was destroyed by rough waves. Fortunately, Musk said his team was able to recover bits of the rocket.
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April 19, 2014
ISS resupply mission successfully launched
And another story from yesterday that I would have covered:
The Falcon 9 rocket lifted off from Cape Canaveral on schedule at 12:35pm PDT (8:35pm UTC), carrying 5,000 pounds of supplies for the ISS. The first stage separated cleanly two minutes and fifty one seconds into the flight, 103km above the launch pad, and the Dragon capsule has deployed its solar panels and is now on course to dock with the ISS in two days, once orbital paths have matched up.SpaceX shoots off the launch pad right on time
It was a very close run thing. The CRS-3 mission was due to take off on Tuesday but was cancelled after a helium leak was detected. Friday’s launch was much tighter, and SpaceX said the launch had a one-second window if the rocket was to successfully insert its cargo into the right orbital plane.
Weather was a big worry for the SpaceX team. There was rain and relatively heavy clouds at the launch site, and the team floated multiple weather balloons into the upper atmosphere to make sure that winds weren’t too strong at altitude.
Unfortunately, the heavy winds and storm conditions in the Atlantic may hamper the second part of Friday’s mission: the remote landing of the first stage of the Falcon 9 rocket. After separating, the booster is planned to fire up again and slow down, falling back towards the Earth.
If all goes well, the rocket will then deploy four legs, which were covered for the initial launch phase, and begin a controlled burn to slowly sink towards the ocean and hover for landing and retrieval. At least, that was the plan.
But the inclement weather means the SpaceX support ship that was due to witness the rocket’s return and retrieve the hardware couldn’t get into position. SpaceX says it will attempt the soft landing anyway, but there’s no word yet on its success or otherwise.
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April 14, 2014
SpaceX to test hover capability on next launch
In The Register, Brid-Aine Parnell explains what will be different about the next SpaceX launch to resupply the ISS:
NASA has said that SpaceX’s latest cargoship launch to the International Space Station will go ahead, despite a critical computer outage on the station, allowing the firm to test the craft’s hovering abilities.
[…]
The booster rocket that’s blasting the Dragon supply capsule into space is going to attempt to make a hovering soft landing after it’s disengaged and dropped back to Earth.
The spruced-up Falcon 9 has its own landing legs, which Elon Musk’s space tech company hopes will eventually make for precise set-downs on the surface of alien worlds. For this test though, the rocket will still be coming down over the ocean, just in case.
The launch is already a month late with its nearly 5,000 pounds of supplies and payloads, including VEGGIE, a new unit capable of growing salad vegetables for the ‘nauts to munch on. The ship was delayed from March after a ground-based radar system at Cape Canaveral was damaged.
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May 13, 2013
Space Oddity … performed in space
International Space Station Commander, Chris Hadfield, performs a revised version of David Bowie’s Space Oddity. Seen in this video is the Larrivée Parlor guitar that has found it’s home on the ISS for the last decade. Chris has used this Parlor, the first guitar in space, to write and record the first musical recordings in space. Here at Larrivée we refer to Chris as “The Space Cowboy”.
Below is the original description as posted by Chris himself on his YouTube channel… enjoy.
Published on May 12, 2013
A revised version of David Bowie’s Space Oddity, recorded by Commander Chris Hadfield on board the International Space Station.
With thanks to Emm Gryner, Joe Corcoran, Andrew Tidby and Evan Hadfield for all their hard work.
Update:
That Bowie remake wasn’t even Chris Hadfield’s first video in space – here he is live with Barenaked Ladies youtube.com/watch?v=AvAnfi…
— David Burge (@iowahawkblog) May 13, 2013
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November 19, 2012
Space-Age technology on Earth, but not so much in space
In The Register, Shaun Dormon explains why almost all the electronic components used on modern spacecraft, satellites, and the International Space Station (ISS) are actually not cutting-edge, top-of-the-line items:
I hate to say it, but most of what you think about space-age technology is a total fabrication. It’s the stuff of sci-fi.
Perhaps the biggest misconception of all is that spacecraft are equipped with cutting-edge computing platforms that any self-respecting technophile would commit unspeakable acts to get their mitts on.
If only. The fact of the matter is that even the most advanced chips up there were considered obsolete ten years ago down here. Although it’s true that in space no one can hear you scream, outer space is actually a very noisy place, electromagnetically speaking.
The computer on your desk is very unlikely to experience much in the way of EM radiation unless someone cuts a hole in the side of the kitchen microwave. Out in orbit, though, there are many sources of radiation, ranging from the relatively mundane stuff pouring out of the Sun and collecting in the Van-Allen radiation belts to more exotic things such as cosmic rays and other high-energy particles that cause so-called “single-event effects”.
[. . .]
The damage is cumulative. Individually, an impact causes the ionisation of a single oxide molecule present in the semiconductor. It’s not enough to cause instant failure, but as more and more impacts take place, the effects combine to significantly alter the electrical properties of the circuit until it can no longer function correctly.
More exciting dangers arise from exposure to gamma or cosmic rays. These ultra-high energy impacts cause localised ionisation which results in an unexpected flow of current. In the case of a lower energy event, this may result in a “single event upset” or “bit-flip”, and data corruption can ensue. These are not usually fatal to the system. No so the worst case “single event burnout”, which creates such high currents that the very circuitry itself is burned out almost instantaneously.
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October 29, 2012
The Dragon returns, bearing cargo
At The Register, Brid-Aine Parnell reports on the mostly successful cargo delivery round-trip by SpaceX’s Dragon capsule:
The reusable cargoship dropped into the ocean yesterday evening around 250 miles off the coast of Mexico after resupplying the ISS and its crew. The Dragon was ferried to a port near Los Angeles where it will be prepped for its return to SpaceX’s test facility in Texas.
Some of the cargo brought back by the capsule is due to be returned to NASA in the next couple of days, including research samples from the station’s microgravity environment. The ship delivered 882 pounds of gear to the ISS, including scientific research and crew supplies. It returned with nearly twice that weight of stuff.
The mission was only a part-success, as the secondary objective was to launch a satellite for Orbcomm, but due to a malfunctioning engine in the launch phase, the satellite could not be placed in the correct orbit and was lost. Orbcomm is sticking with SpaceX for two more satellite launches in spite of this initial failure.
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October 9, 2012
Falcon 9 loses an engine, able to partially complete mission
Lewis Page at The Register, with a well-timed reminder that work in space is still not routine or ordinary:
The Falcon 9 rocket from upstart rocket firm SpaceX, which lifted off yesterday with supplies for the International Space Station, will deliver those supplies successfully following loss of an engine during launch. However a commercial satellite which was also aboard the rocket has been placed into a lower orbit than planned as a result of the mishap.
As we previously reported, the nine-engined Falcon first stage suffered an engine failure as it climbed towards space, with launch video giving the impression that one of the Merlin rockets had lost its nozzle. The Falcon is designed to carry out its mission even having lost an engine, and the flight path was duly adjusted. The Dragon capsule with supplies for the International Space Station was successfully sent on its way and is expected to reach the ISS without trouble.
[. . .]
Orbcomm says it is investigating the possibility of getting its satellite into the right place using its own onboard propulsion. Even if this can be achieved, however, it will be unsatisfactory as a satellite’s own fuel must be sparingly eked out over its operational lifespan to maintain it in orbit. Using up a lot of it before even beginning operations is liable to mean a short working life for the Orbcomm bird.
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June 18, 2012
Speculation on the intended mission of the X-37B
A blog post at New Scientist compares the achievement of the Chinese space program, which just successfully placed three astronauts aboard the ISS and the highly mysterious X-37B spaceplane which just completed a 469-day mission:
China’s space agency took the plaudits for successfully docking its crewed Shenzhou-9 spacecraft with its orbiting lab Tiangong-1 today, but the feat was slightly overshadowed by the weekend landing of the US X-37B spaceplane, which after a record-breaking orbital flight of 469 days showed just how far China has to go to catch up with advanced spacefaring nations.
At around noon local time, the Beijing Aerospace Control Centre relayed live pictures of Shenzhou-9’s docking on state broadcaster China Central Television. The space capsule held off at a distance of 62 kilometres from Tiangong-1 before making its docking approach just before 2pm — and once the crew had manually locked on to the latter’s cruciform docking target it took only eight minutes to latch the spacecraft together safely.
[. . .]
This Boeing-built spaceplane, roughly one quarter the size of the space shuttle, is equally mysterious. It flies to orbit on a regular rocket and when there deploys a solar array that gives its sensors the power they need for extended missions. It also has enough propellant to fire thrusters that make small changes to its orbit in a bid to foil surveillance. The vehicle re-enters the atmosphere just like the shuttle but lands entirely autonomously, making it a space drone.
At no point has the USAF revealed the craft’s purpose: in addition to spacecraft surveillance, it could deploy a robot that repairs (or disables) satellites in orbit, say some, while at the darker end of the spectrum of possibilities — it was a DARPA project in its early days — it could carry a warhead, using its drone homing capability to provide surprise precision strike from orbit.
