Our collective attention
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    ptfrd
    2d ago 100%

    I find the defendant not guilty! I think the NSF guy's idea involved replacing the woman & her arms and the daughter with the tower & "chopstick" arms, and a Super Heavy rocket booster (which is in the process of being caught by the arms). Something like that?

    The closest I've seen is this. Not great!

    So I tried getting Chat GPT to do a better one for me. This did not go well 😂 But surely someone with experience should be able to cajole a suitable generative AI tool to do a good job of it?

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  • Starship IFT-5 Launch Thread! (First booster catch with chopsticks)
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    ptfrd
    6d ago 100%

    One of my favourite videos of the catch, because of what happens when the sonic booms arrive!: https://youtu.be/749dRxbSkVU (They're at 6:51.) Also it's a different angle from most of the others, because it's from Mexico.

    And a playlist: Starship IFT5 booster catch, original footage only

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  • Superheavy Landing Burn And Catch - LabPadre Rover 2
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    ptfrd
    6d ago 100%

    Link currently doesn't WFM.

    I believe when you create a clip from an ongoing YouTube live stream, it will (at best) only work as long as the footage you selected is still available on the stream. And I believe YouTube only keeps the most recent 12 hours of footage.

    (What they should do is create a permanent copy of the relevant footage, assuming the channel owner permits it.)

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  • Europa Clipper has been encapsulated inside its Falcon Heavy fairing
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    ptfrd
    2w ago 100%

    The fairing looks spotless. I guess they're using a new one, at least partly for reasons of cleanliness? (Planetary protection and all that.)

    With boosters we're at the point where "flight proven" is no longer just a euphemism for "second hand". I've felt that way myself for a few years. And NASA basically confirmed they agree a couple of months ago, when the brand new booster intended for Crew-9 was given a Starlink mission first, increasing confidence in it after a minor problem during transport. (IIRC)

    But I'm not sure if we're at that point with fairings. Or even if we'll ever be.

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  • NASA is working on a plan to replace its space station, but time is running out
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    ptfrd
    2w ago 100%

    Is it the end of days if NASA goes without a low-Earth orbit space station for several months or even years? One key commercial space official at the space agency, Phil McAlister, suggested that maybe it wouldn't be.

    He's right, and I hate him for it :)

    Expedition 1 arrived at the International Space Station on 2000-11-02. That's 59-and-a-bit days before[1] the start of the 21st Century. So whatever disappointments people may have about the 21st Century compared to their expectations, at least we can (currently) say there has been a continuous human presence in outer space for the entirety of it. Pretty cool!

    Strikingly, it could easily be the case that there will never again be a time with humans only living on Earth. If that's because AGI kills us all in a decade, with any people in orbit / on the moon being the last to have their atoms repurposed, that's not ideal. But if it's because we spread out through the universe, and outlive our sun and even our galaxy, that could (potentially) be very cool indeed.

    Perhaps everyone reading this either witnessed the start of, or was born during, humanity's Second Age!

    Or perhaps the current period of continuous off-Earth habitation will finish around 2030 and all my attempts at profundity were a waste of time! After all I'm not sure how much I'd want NASA to spend just to maintain it.

    Of course, the ISS isn't the only hope here. The Chinese space station might fill in any gaps after the ISS, although that would be a concern for other reasons (assuming China is still controlled by its communist party, with other parties banned). And then there's the moon. The Artemis Program in its current form won't bring about the start of a continuous presence on the moon by 2030. But I wouldn't put it past SpaceX to shake things up in that regard.

    [1] - If you thought the 21st Century started at the start of 2000, see this or even this.

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  • Sierra Space Ghost: Revolutionizing Global Logistics
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    ptfrd
    2w ago 100%

    What's the 'unique selling point' of this compared to existing Earth re-entry systems? The parafoil giving 100 metre landing accuracy?

    Were existing heavy duty systems all designed to ultimately be suitable for humans? And this? Could some future version be used for humans? If not, does ditching that criterion allow for massive efficiency improvements?

    P.S. I thought they had a typo, but no. (Well, not really.) You learn something new every day.

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  • Dragon can now use SuperDracos if parachutes fail
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    ptfrd
    3w ago 100%

    I like SpaceX's Sarah Walker, despite (or partly because of?) the fact that she tends not to answer questions from mere mortals (non-SpaceX / non-NASA personnel).

    For example, at the Post-Launch News Conference, there was a question about pulsive splashdown (although that term was not used).

    She seemed to imply that the capability would have been available for Crew-7 if it wasn't for a problem with one of the GPS sensors. (Was this problem known about well in advance of undocking? Would that be why they didn't announce the new capability at the time?)

    She spent most of the time confirming the point I made in my first comment on this post, about taking into account any extra risks that this capability might add, and she said that it had taken "years".

    She didn't answer whether it's available if the parachutes fail during a launch abort, nor tell us any of the (non-NASA) missions it has been active for (of which Gerst had said there were "several").

    Here's the question: https://www.youtube.com/live/wwhfph1vGdE?t=32m30s (at 32:30)

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  • Dragon can now use SuperDracos if parachutes fail
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    ptfrd
    3w ago 100%

    When composing the title of this post I nearly called this technique 'Propulsive Splashdown', but I didn't remember ever hearing that term used before. (Stitch didn't call it that, did he?)

    Later I heard Stephen Clark use that term in his question. And yesterday that term was used during the launch stream. Nail and Cardman spent a minute discussing the capability: https://www.youtube.com/live/SKXtysRx0b4?t=3h29m8s (from 3:29:08)

    Apparently they often abbreviate it to "prop splash".

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  • Dragon can now use SuperDracos if parachutes fail
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    ptfrd
    3w ago 100%

    At 52:05, Stephen Clark asked about this. The start of Gerst's answer is:

    We've actually flown it on several other dragon flights before this. This is the first time it flies on a NASA mission.

    So, perhaps Inspiration 4? Presumably Polaris Dawn? And I guess the Axiom missions are being counted as non-NASA in this context, so some of those?

    Before doing something like this I think you should ensure that it reduces the overall risk to the crew. So you'd need to have an estimate of how likely it is that all the parachutes fail, and how likely it is that the SuperDracos could save lives in that situation, but also an estimate of how likely this capability is to go wrong. For example, could there be a bug in the software or in some sensor(s), that causes the SuperDracos to fire when they weren't needed? Would the SuperDracos otherwise be in an inactive state during re-entry, and if so, what are the risks of having them active? Etc..

    Those 2 sentences from Gerstenmaier suggest to me that SpaceX had already decided that, on balance, this capability should be enabled. Whereas NASA have only just reached that conclusion.

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  • https://www.youtube.com/live/rJghQoIyH8Y?t=20m15s

    Steve Stich states at today's Crew-9 news conference that Dragon has a new contingency capability if all 4 parachutes fail; the SuperDracos will ignite prior to splashdown. The Crew-8 return to Earth will also have this capability. (He said this about 20 minutes after the start of the [stream](https://www.youtube.com/live/rJghQoIyH8Y).)

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    After another Boeing letdown, NASA isn’t ready to buy more Starliner missions
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    ptfrd
    1mo ago 100%

    first operational mission for August 2025. But the agency set that schedule before realizing Boeing and Aerojet Rocketdyne would need to redesign seals and perhaps other elements

    Not sure this is correct. I had thought the slip from Feb 2025 to Aug 2025 was only announced quite recently. Say, a month ago?

    (Not that I'm saying I think the Aug 2025 date will be achieved. I'm 75% sure it won't.)

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  • news
    News 2mo ago
    Jump
    56 days and counting: Two NASA astronauts are still in space as tests on Boeing capsule continue
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    ptfrd
    2mo ago 100%

    as far as I’m aware, they’ve done 1 EVA to look at the thing

    Don't think so.

    They do have access to camera imagery, but as you say, most problems like this probably need much more intrusive investigation.

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  • Why is it always you three?
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    ptfrd
    2mo ago 100%

    How could I forget!

    TBH, I mean that in the sense that you can't forget something you never knew about in the first place ;)

    I had never heard of this concept before. Is it something to do with this?

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  • NASA makes a very tough decision in setting final Crew-9 assignments
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    ptfrd
    2mo ago 100%

    If the Boe-CFT mission had gone to plan, Crew-9 would have been scheduled to launch in mid August with Zena Cardman commanding. The article reports that she has just announced that her father died in August, perhaps about a week before what would have been the launch date.

    Got me wondering how situations like that are handled. And what if a close family member dies just a day or two before launch? Or even less time than that?

    On a related matter, I've also been wondering at what point the backup crews are 'stood down'. I don't think it's the very last minute. I think there's a window of time during which any serious issues to do with a member of a primary crew would just result in a scheduled launch not going ahead (as opposed to going ahead on schedule but with a crew member swapped out).

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  • It got too shady 😭
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    ptfrd
    2mo ago 100%

    Damn, they should've collab'ed with the Marshall Mathers Space Flight Center, like I been sayin

    (I sent two letters back in autumn, JAXA must not've got 'em. There prob'ly was a problem at the post office or somethin)

    2
  • https://youtu.be/-0XVM92cxjc?t=8m36s

    A Youtuber called [Ellie in Space](https://youtube.com/@ellieinspace) claims that a NASA source sent her the following message. It was in response to a question about when NASA knew that the [Boe-CFT mission](https://en.wikipedia.org/wiki/Boeing_Crew_Flight_Test)'s Starliner vehicle would not be able to undock and return to Earth autonomously without being reconfigured. > So if you want to know when??? Well always, but it wasn't a reasonable consideration to retain the unmanned Starliner capsule software to work in the manned version of the capsule as a contingency. Would you call that a mistake?? Maybe, but let's think about the need to really ever plan to send folks up to space and leave them there with no way to fly home... they would always chose to risk the ride vs having no way home. > > No one really considered this very unique and dynamic situation would happen. ## Background I believe this issue was [first brought to light by Eric Berger](https://arstechnica.com/space/2024/08/nasa-likely-to-significantly-delay-the-launch-of-crew-9-due-to-starliner-issues/). > Regardless, sources described the process to update the software on Starliner as "non-trivial" and "significant," and that it could take up to four weeks. This is what is driving the delay to launch Crew 9 later next month. A couple of days later, NASA held [a press teleconference](https://www.youtube.com/live/DYPL6bx87yM) in which they emphasized that what was needed was merely a "data load", not a software change. But they indicated timelines that do seem consistent with the "up to four weeks" claim by Berger's source. ## My questions Aren't there several realistic scenarios where you'd want to undock a crew vehicle, without its crew (or at least without them being in a fit state to operate the vehicle), in less than 4 weeeks? Can Crew Dragon do it? Soyuz?

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    https://www.youtube.com/live/AZFUUEEjYqU?t=18m6s

    Relevant portion of the video is 18:06 - 22:22. Key quote: "We'll move a Dragon recovery vessel to the Pacific some time next year, and we'll use SpaceX facilities in the Port of Long Beach for initial post-flight processing". Although this was revealed in a Crew-9 briefing, it doesn't actually apply to Crew-9. The announcement has just now been [posted to the SpaceX website](https://www.spacex.com/updates/#dragon-recovery-to-return-to-the-us-west-coast). Key excerpts: > During Dragon’s first 21 missions, the trunk remained attached to the vehicle’s pressurized section until after the deorbit burn was completed. Shortly before the spacecraft began reentering the atmosphere, the trunk was jettisoned to ensure it safely splashed down in unpopulated areas in the Pacific Ocean. > After seven years of successful recovery operations on the U.S. West Coast, Dragon recovery operations moved to the East Coast in 2019, enabling teams to unpack and deliver critical cargo to NASA teams in Florida more efficiently and transport crews more quickly to Kennedy Space Center. Additionally, the proximity of the new splashdown locations to SpaceX’s Dragon processing facility at Cape Canaveral Space Force Base in Florida allowed SpaceX teams to recover and refurbish Dragon spacecraft at a faster rate [...] > This shift required SpaceX to develop what has become our current Dragon recovery operations, first implemented during the Demo-1 and CRS-21 missions. Today, Dragon’s trunk is jettisoned prior to the vehicle’s deorbit burn while still in orbit, passively reentering and breaking up in the Earth’s atmosphere in the days to months that follow. [...] > When developing Dragon’s current reentry operations, SpaceX and NASA engineering teams used industry-standard models to understand the trunk’s breakup characteristics. These models predicted that the trunk would fully burn up due to the high temperatures created by air resistance during high-speed reentries into Earth’s atmosphere, leaving no debris. The results of these models was a determining factor in our decision to passively deorbit the trunk and enable Dragon splashdowns off the coast of Florida. > In 2022, however, trunk debris from NASA’s Crew-1 mission to the International Space Station was discovered in Australia, indicating the industry models were not fully accurate with regards to large, composite structures such as Dragon’s trunk. [...] > After careful review and consideration of all potential solutions – coupled with the new knowledge about the standard industry models and that Dragon trunks do not fully burn-up during reentry – SpaceX teams concluded the most effective path forward is to return to West Coast recovery operations. > To accomplish this, SpaceX will implement a software change that will have Dragon execute its deorbit burn before jettisoning the trunk, similar to our first 21 Dragon recoveries. Moving trunk separation after the deorbit burn places the trunk on a known reentry trajectory, with the trunk safely splashing down uprange of the Dragon spacecraft off the coast of California.

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    www.spacex.com

    That's 27 hours from now. > SpaceX is targeting Saturday, July 27 for a Falcon 9 launch of 23 Starlink satellites to low-Earth orbit from Launch Complex 39A (LC-39A) at NASA’s Kennedy Space Center in Florida. Liftoff is targeted for 12:21 a.m. ET, with backup opportunities available until 4:21 a.m. ET. [And here is their blogpost, dated 2024-07-25, announcing that the mishap report has been submitted to the FAA, and discussing some of the details.](https://www.spacex.com/updates/#falcon-9-returns-to-flight) > During the first burn of Falcon 9’s second stage engine, a liquid oxygen leak developed within the insulation around the upper stage engine. The cause of the leak was identified as a crack in a sense line for a pressure sensor attached to the vehicle’s oxygen system. This line cracked due to fatigue caused by high loading from engine vibration and looseness in the clamp that normally constrains the line.

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    www.spacex.com

    >During tonight’s Falcon 9 launch of Starlink from Space Launch Complex 4 East at Vandenberg Space Force Base in California, the second stage engine did not complete its second burn. As a result, the Starlink satellites were deployed into a lower than intended orbit. SpaceX has made contact with five of the satellites so far and is attempting to have them raise orbit using their ion thrusters. There's also [a tweet](https://x.com/SpaceX/status/1811635860481454487) saying the same thing in fewer words. This is the affected mission: [Starlink 9-3 launch bulletin](https://sh.itjust.works/post/22118381) Let's hope it was due to SpaceX pushing the envelope on their in-house Starlink missions in some way, though I have no specific guesses along those lines. Perhaps a manufacturing defect or an operational mistake are more likely to be the leading candidates for the cause.

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    www.youtube.com

    Quote from Bill Nelson: >... SpaceX, by having the return of the first stage, has brought the cost down significantly. That has affected the entire launch industry. We'll be seeing attempts at bringing the second stage down on some missions. The key sentence is (currently) 52 minutes and 48 seconds into the video. Approximately 49 minutes after the event started. No other mention is made of this. Should we assume he's specifically referring to the 2nd Stage of the Falcon 9? What is the likelihood that he is mistaken? Could he just be thinking of the existing deorbit procedure? Or could SpaceX be putting parachutes on some of their 2nd Stages in the near future?

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