Deep Space Updates - SpaceX, Hayabusa Shoots an Asteroid, Mars Quakes - April 26th

Deep Space Updates – SpaceX, Hayabusa Shoots an Asteroid, Mars Quakes – April 26th

alloyed scott manley here with another set of deep-space updates because i think that's what we're calling this by now I want to start with Hayabusa which is Japan's spacecraft orbiting a small asteroid called lugu at the start of the month it deployed its SC eye that is the small carry-on impactor and what it is was a projectile weapon a shaped charge that would fire a slug of copper into the asteroid to make a crater so they could sample the interior now this was a very delicate maneuver the spacecraft obviously didn't want to be in line of sight for this because debris could fly off and hit the fragile spacecraft so not only did it deploy the small carry on an impactor in it set in an orbit so that it could fire at a later time it also deployed a camera DCAM deployable camera which would photograph the whole thing and then of course the spacecraft moved to the far side it fired and just today it was performing maneuvers to get down close and find the hole that it made so now we have an image showing the plume of ejecta coming off the asteroid which is cool but we now have this great image of the damage to the surface and it's great I mean you can see the interior is darker you can see the displaced material and of course once they've checked this out they are gonna send the spacecraft down into this to collect his sample because it's gonna return a sample of pristine asteroid material to the earth even by next year so that's pretty amazing that they've got this they also have a sample from the surface and it still has another couple of robots to deploy but great going there Hayabusa and now we go to Mars where insight has been collecting data and this week published the first evidence of a Mars quake and we actually have an audio recording of it which is pretty amazing so previously they sent seismometers to Mars on voyage on certain in the Vikings and the Vikings they had issues with the wind so the course insight came up with this seismometer which would sit directly on the surface of Mars and then have a wind cover over the top and so that increased sensitivity has now enabled them to detect a very weak tremor but it's the first one I mean look I live in California we see these things popping up and they alerts all the time they're nothing this is on Mars where nothing has ever been detected before but it's the first evidence that Mars is currently geologically active in some way so that's great but they also have some updates on their mall if you remember the the heat penetration package was supposed to burrow down like 16 feet into the surface and you know figure out whether there is heat coming up from the interior after they started doing this back in February the probe got stuck about one foot down about 30 centimeters and they have been very carefully trying to figure out what's going on with it now they're not sure whether the probe is stuck in the you know in the launch hardware and the deployment hardware they're not sure if it's sitting up against a rock or a hard gravel layer they have actually been running the hammering action it's kind of like a self-driving nail this thing goes bang bang bang knocks its way down and they were they've been running it and trying to collect seismic data with the seismometer to see if they can ascertain what's going on they've also got teams working in simulated labs that like her at JPL they have the in situ instrument lab where they basically test Hardware on simulated Mars and in fact I was there at JPL when I was driving to SoCal Doug Ellison gave us a tour and we could see people working on the simulated version of the insight it's it's really kind of cool to see this going on um so yeah that still hasn't got any further they still haven't made any decisions as to what they're gonna do with it you know there's some suggestion that they can hold the arm on top just to add extra pressure there's some people saying they might need to move this but that's a you know they are a long way from home and if anything breaks they can't fix it they can't send anyone to fix it so you know understandably they're moving slowly the spacecraft is gonna work quite well for a long time meanwhile for the spacecraft that didn't work so well dragon to the story hasn't really changed since my quick impromptu video the main thing that's changed is we don't think the Draco thrusters or directly also the super Draco thrusters are directly responsible anymore there was there have been some comments from like the Aeronautics space advisory panel oh sorry aeronautics safety advisory panel and various NASA people saying that they have faith in SpaceX we've confirmed that the testing was done on the pad and that they test the regular Draco thrusters and then they were gonna test the super Draco thrusters and that's when something happened and there was a leaked video which you've probably seen elsewhere by now it is awful it is like a 144p resolution 10 frames per second and then on top of that the frame is flipped you know into portrait mode and has big black bars down the same sights there's only like yeah tiny tiny resolution on this but it's enough to show that we see what looks more like a big cloud of white material white cloud or whatever it casts a shadow if you look very carefully which means that it's not a white-hot explosion this is like a cloud of vapor for the first couple of frames and then it explodes it happens very very rapidly it also appears to be centered not on one of the thruster pods with the Draco's but somewhere in between and this is evidence to me that it's not the Drake was firing it's something to do with the way they are integrated into the spacecraft the fuel the propellant the pressurization system that would be what I think is going on here there's no evidence that they have begun to fire the engines there's no like smoke or anything coming out of it this thing basically went from perfectly fine to a big blast and that to me says a failure any highly pressurized tank now the super Draco thrusters have a chamber pressure of 1,000 psi according to Elon Musk and that means of course that you're a monomethylhydrazine fuel tank and you're dinitrogen tetroxide tank both have to be pressured to a higher level than that and these are both pressurized by a helium tank so that helium tank even needs to be even higher pressure than that so it can push all the fuel load and the fuel and the oxidizer so I mean it's not unreasonable to have these things maybe at like 3000 4000 5000 psi and the truth is that sounds like a lot but actually tanks similar tanks that flew on the space shuttle they were pressurized to even higher levels so it's not out of the realms and I know that SpaceX has had terrible problems with Co Peavey's like there are two big rocket failures were both precipitated by events related to their composite overwrapped pressure vessels that's the word I've been seeing Co P V s and and you know there was a lot of talk about how NASA was getting SpaceX to change their designs because they were concerned and that wasn't because the design was inherently unsafe it was because they were putting these inside liquid oxygen tanks and that had never been done before and of course by doing this they discovered an entirely new failure mode which involved carbon fibers breaking under tension and causing a spark that will ignite the lining of the exterior of the tank that's you know crazy failure and yet this does seem to me like a pressure vessel of a similar sort breaking for some reason and I mean obviously they've done a lot of testing on all these systems they know these things are well within their limits but when you integrate all this stuff and you have to make it work for the launch escape system the launch escape system is supposed to fire at full thrust for something like seven seconds and to fire a fool' thrust a draco engine needs about 31 kilograms of propellant per second so yeah eight of them that means 250 kilos of propeller per second which you have to push down the fuel lanes to get there when you're moving that my fuel that quickly you have to start you get worrying about things like transient pressure rises from the momentum of the fuel that's what's called the fluid hammer so I I don't know what they're still looking at it this is of course was a test so it was highly instrumented they would have pressure sensors temperature sensors all sorts of sensors wherever they can have a sensor they would have a sensor and they probably have a ton of data to go through they're not gonna be debugging this based on that crappy cell phone video that everybody else is trying to you know read something into but I mean the other good news of course is that SpaceX is actually continuing with their planned launch of CRS 17 which is very direct evidence that NASA has a lot of faith in them and also that the Draco thrusters weren't involved because the Draco thrusters are on both the Dragon 1 and the dragon 2 and you know you would think if there was anything related to that then they would obviously suspend their flight an interesting thing about CRS 17 which is going to launch next week on April 30th it would normally land at landings on the booster would and because of course there is no an investigation therefore they might be picking up pieces and they might also have to decontaminate it because you know MMH is kind of nasty stuff there instead gonna land on a barge just off the course so this is gonna be a great opportunity for people to actually see what a barge landing looks like if you can get in the right place you might be able to see it if you get if you're a little further away you'll build to see the rocket landing on the other side of the horizon but still see the top of it so yeah it's a great place to bring your Flat Earth friends and just as SpaceX seems to have had a bad run of luck with their pressure vessels Elon Musk seems to have had a bad run of luck with their 4/20 I mean there was that whole tweet about taking Tesla private at 4:20 they had the whole smoking pot and getting investigated and then they had this dragon to test failure which happened on 4/20 yeah I should point out that CRS 17 is supposed to launch at 422 so missing it just by a couple of minutes I'm Scott Manley fly safe

41 thoughts on “Deep Space Updates – SpaceX, Hayabusa Shoots an Asteroid, Mars Quakes – April 26th


  2. About 3000psi is a pressure seen in dive tanks. Not exotic, but with other engineering constraints (weight/space) it can quickly get more challenging.

  3. Hello Scott! Shouting out that i am a " Manley" also who is related to william Louis manley who found death valley in 1849……you live in California i hear. Maybe we are distant cousins😁

  4. 5000psi is only 344bar, you can get scuba tanks with a working pressure of 300bar (and a much higher test pressure).

  5. Guessing this is not a literal microphone-based sound recording, but a translation of detected vibrations into sound.

    (Yes, I know sound is vibrations, but still, picked up by seismic instruments, not audio ones. I mean, it discerns horizontal vibrations, right?)

  6. Why is it that I get better pot jokes and better information from a Manley Scot than all other sources combined? Media is dead. Long live Scott Manley.

  7. Highest pressures I have ever seen in action and up close was a water jet at 45,000 psi being used to carefully cut the rubber coating off the USS Virginia prior to commissioning. Was so they could remove a piece that had been damaged and need to be replaced. Cause of the pressure of the water cutter they carefully controlling the distance to ensure it only cut the rubber coating and not the steel hull underneath.

  8. that is not crappy cell phone vid. this is modem era kinky internet clip quality. which was filmed with era appropriate gear on someone's screen. why it was shared like this? it smells like some ufo fakes made intetionally low q to hide obvious editing fakes. we need Captain Disillusion to clear things up for us

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