** The Official Space Flight Thread - The Space Station and Beyond **

Flight abort system worked flawlessly, but equally impressive is the fact that the booster didn't actually turn into a cloud of debris and kept on transmitting telemetry data right up until impact with the desert.
 
Kipping explains why the sheer randomness of the universe means quantum entangled particles could never be used for galactic communications. The explanation is really easily explained and easy to understand from this. FTL exists, in causality, but not for information. No doubt in the distant future it will be understood how spooky action at a distance works, and something else is invented to harness that methodology, but QEC is a non starter due to the probabilistic nature of the universe. Or maybe some things just aren't meant to be broken and entanglement will forever remain a mystery.

 
SLS cryogenic test before the next launch window on the 27th currently ongoing. But the Hydrogen cryogenic fill has been stopped again due to the same leak indication that scrubbed it last time. They're trying to let the lines warm again like last time to see if the seals seat better.

Honestly at this point, it'll be back to the VAB for a tear down.
 
Testing finished, the leak finally "stabilised" at around 4% loss (and at a lower pressure than initially tested at which caused the initial leak) which NASA seem OK with so far, although may change once they get more data through-out the venting and post-test checking.
 
ianh said:
Testing finished, the leak finally "stabilised" at around 4% loss (and at a lower pressure than initially tested at which caused the initial leak) which NASA seem OK with so far, although may change once they get more data through-out the venting and post-test checking.
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Was interesting watching the test and listening to their troubleshooting process. We’ll have to see if that leak % is acceptable during the launch window or if they can use the data from today to understand where/when it’s happening.

Be typical now that they get a go for launch only to be stopped by the weather on the 27th.
 
At least the leak is a "new" leak as it's from the 4in quick-disconnect rather than the far bigger leak (now apparently cured) from the 8in pipework. I'm hoping the 27th goes ahead but I worry that the post-test inspections are going to show more issues with the various seals being used.
 
Here's something I've been wondering for a while. Space vehicles like the Shuttle and ISS are continually travelling at about 17, 500 mph. But we never see that speed of course, it always looks calm and slow from above earth. If it was possible to fly at 17, 500mph on earth and the ISS or space Shuttle, Artemis were about to fly over us, would it be even be visible or just too fast for the eyes/brain to register? I imagine we wouldn't even see it had gone past us, at any height, apart from the noise.
 
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Merlin5 said:
Here's something I've been wondering for a while. Space vehicles like the Shuttle and ISS are continually travelling at about 17,500 mph. But we never see that speed of course, it always looks calm and slow from above earth. If it was possible to fly at 17,500mph on earth and the ISS or space Shuttle, Artemis were about to fly over us, would it be even be visible or just too fast for the eyes/brain to register? I imagine we wouldn't even see it had gone past us, at any height, apart from the noise.
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You can watch the ISS go over with the naked eye, it's quite bright, takes a while to traverse across the sky.
 
mid_gen said:
You can watch the ISS go over with the naked eye, it's quite bright, takes a while to traverse across the sky.
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Yeah, but if it was flying over our heads at the same height as say a low flying jet fighter plane, I'm guessing we wouldn't be able to see it because 17500 mph is just too fast for our eyes?
 
Merlin5 said:
Yeah, but if it was flying over our heads at the same height as say a low flying jet fighter plane, I'm guessing we wouldn't be able to see it because 17500 mph is just too fast for our eyes?
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I'd be more concerned about getting battered by the shockwave and losing my hearing to worry about seeing it :D It would certainly go past very quickly, though you could probably see it.

All movement is relative though!
 
mid_gen said:
I'd be more concerned about getting battered by the shockwave and losing my hearing to worry about seeing it :D It would certainly go past very quickly, though you could probably see it.

All movement is relative though!
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Lol yea, the sound would be unbelievable. I'm really not sure if we could actually see something travelling that fast. Apparently the fastest bullet from a gun is around 1,800 mph. We wouldn't be able to see that bullet in flight and that's nowhere near 17, 500mph.
 
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Merlin5 said:
Lol yea, the sound would be unbelievable. I'm really not sure if we could actually see something travelling that fast. Apparently the fastest bullet from a gun is around 1,800 mph. We wouldn't be able to see that bullet in flight and that's nowhere near 17,500mph.
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Bullets are tiny though, the ISS is over a hundred metres long, I'm pretty sure you'd register something if it passed in a vacuum, if you were looking for it anyway.
 
Merlin5 said:
Here's something I've been wondering for a while. Space vehicles like the Shuttle and ISS are continually travelling at about 17, 500 mph. But we never see that speed of course, it always looks calm and slow from above earth. If it was possible to fly at 17, 500mph on earth and the ISS or space Shuttle, Artemis were about to fly over us, would it be even be visible or just too fast for the eyes/brain to register? I imagine we wouldn't even see it had gone past us, at any height, apart from the noise.
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As always, someone else has thought of this before…:D

 
Penfold101 said:
As always, someone else has thought of this before…:D

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Brilliant. :D Someone in the comments section said "Manhattan came and went in 2 seconds". So if it could be seen at all from the ground looking up, I reckon it would be visible less than something like a nano second. Quite awesome thought really to visualise just how fast spacecrafts go.
 
Merlin5 said:
Brilliant. :D Someone in the comments section said "Manhattan came and went in 2 seconds". So if it could be seen at all from the ground looking up, I reckon it would be visible less than something like a nano second. Quite awesome thought really to visualise just how fast spacecrafts go.
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Well, don't forget that you personally are travelling around 65,000 mph....relative to Sagittarius A* ;)
 
Looks like NASA has scrubbed the Sept 27th Artemis launch and will make the decision on whether to roll it back into shelter, until the large Tropical Storm Ian passes by, sometime tomorrow or possibly early Monday morning -

Artemis

blogs.nasa.gov blogs.nasa.gov

NASA is foregoing a launch opportunity Tuesday, Sept. 27, and preparing for rollback, while continuing to watch the weather forecast associated with Tropical Storm Ian. During a meeting Saturday morning, teams decided to stand down on preparing for the Tuesday launch date to allow them to configure systems for rolling back the Space Launch System rocket and Orion spacecraft to the Vehicle Assembly Building.

Engineers deferred a final decision about the roll to Sunday, Sept. 25, to allow for additional data gathering and analysis. If Artemis I managers elect to roll back, it would begin late Sunday night or early Monday morning.
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