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Space Thread

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Lucky Jack Aubrey
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Re: Space Thread

Thu Apr 11, 2019 6:26 pm

Nicely done SpaceX.

I hope they have some alternate video of the center core landing.
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Usacomp2k3
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Re: Space Thread

Thu Apr 11, 2019 8:45 pm

Holy cow that was amazing. We watched it from Playalinda which is maybe 4 miles away. Incredible. Anyone who follows me on Twitter can see my shots.
The noise was incredible. So soon after the launch too. Im used to a 45sec or longer delay. The lights were so bright. Crazy. Was able to watch the booster separation but then lost them in the sky except for the various burns the landing was amazing. Couldn’t see the center core landing at all. Hats off to SpaceX
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drfish
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Re: Space Thread

Fri Apr 12, 2019 9:14 am

So insanely jealous. I think it's going to be awhile before I can make another trip happen. Will have to shoot for covering a couple days in case of a scrub like last time.
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Usacomp2k3
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Re: Space Thread

Fri Apr 12, 2019 9:16 am

I have the TESS launch picture actually on my wall calendar right now.
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Kougar
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Re: Space Thread

Fri Apr 12, 2019 11:59 am

For anyone that hasn't seen XKCD:

Image


SpaceX's Falcon Heavy triple landing was awesome, but apparently that wasn't enough. SpaceX also recovered both fairing halves from this mission and plans to reuse them. I didn't realize that not only do the fairing halves have chutes, but also apparently avionics and nitrogen for maneuvering with steerable chutes. :o
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Redocbew
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Re: Space Thread

Fri Apr 12, 2019 1:10 pm

There's an old TED talk where Katie Bouman goes into a bit more detail on the algorithm she helped develop to image the black hole. It's the kind of elegant solution that makes sense and almost sounds simple once you hear it.

https://www.youtube.com/watch?v=BIvezCVcsYs
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Kougar
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Re: Space Thread

Tue Apr 16, 2019 5:34 pm

Almost sounds "simple" indeed... even the logistics to make it happen was nuts.https://www.extremetech.com/extreme/289 ... image-data

In SpaceX news, unfortunately the central core booster took a plunge into the sea. Apparently their remote robot that ties down boosters can't secure modified Falcon heavy core boosters and the drone ship got stuck in bad weather. Parts are salvageable but the booster won't be flying again. :(
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Redocbew
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Re: Space Thread

Tue Apr 16, 2019 5:44 pm

Yeah it's not surprising really that they had to resort to shipping hard drives around instead of transferring the data electronically. Not only is the sheer amount a problem, but then you'd have to run checksums on all of it to make sure there hadn't been any transmission errors. With that much data, the TCP checksums alone almost certainly wouldn't have been enough.
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Usacomp2k3
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Re: Space Thread

Tue Apr 16, 2019 7:56 pm

Kougar wrote:
In SpaceX news, unfortunately the central core booster took a plunge into the sea. Apparently their remote robot that ties down boosters can't secure modified Falcon heavy core boosters and the drone ship got stuck in bad weather. Parts are salvageable but the booster won't be flying again. :(

They’ve been abnormally coy about what has or hasn’t survived. Very uncharacteristic of them IMHO.
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just brew it!
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Re: Space Thread

Tue Apr 16, 2019 10:44 pm

Redocbew wrote:
Yeah it's not surprising really that they had to resort to shipping hard drives around instead of transferring the data electronically. Not only is the sheer amount a problem, but then you'd have to run checksums on all of it to make sure there hadn't been any transmission errors. With that much data, the TCP checksums alone almost certainly wouldn't have been enough.

The error rate of the hard drives becomes an issue at that volume as well, so you need some sort of additional error correction codes anyway if you want to be assured that every bit that was recorded is transferred correctly.

That said, they might not actually care if there's a missing or corrupted block here and there. It'll all get lost in the statistical noise.
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Redocbew
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Re: Space Thread

Tue Apr 16, 2019 11:31 pm

There's also a talk Dr. Bouman gave at Caltech just a few days ago where shes goes into much more detail. After watching about 15 minutes of that the solution doesn't sound simple anymore. :lol:
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Kougar
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Re: Space Thread

Thu Apr 18, 2019 5:56 pm

Usacomp2k3 wrote:
They’ve been abnormally coy about what has or hasn’t survived. Very uncharacteristic of them IMHO.


In what way? The thing went for a swim, and it isn't worthwhile to clean and repair them after saltwater contamination. That they can salvage anything off of it would be a bonus. Probably compromised the structural integrity of the booster when it landed on the railing while tipping into the water. They were quite clear when they said it wouldn't be flying again.
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Usacomp2k3
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Re: Space Thread

Thu Apr 18, 2019 10:20 pm

Based on the pictures today, it looks like it sheared off between the LOX and RP1 tanks. All 9 engines are fine admit appear to even have been ocean-dunked. A few of the nozzles are dinged up. The Titanium gridfins are all gone though, which is probably the most costly loss.
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Usacomp2k3
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Re: Space Thread

Sat Apr 20, 2019 7:04 pm

Well it looks like the Capsule that was supposed to fly the In Flight Abort mission blew up during testing today. Oops.
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Kougar
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Re: Space Thread

Sun Apr 21, 2019 5:30 pm

Usacomp2k3 wrote:
Well it looks like the Capsule that was supposed to fly the In Flight Abort mission blew up during testing today. Oops.


Yep, during the final test whatever that was. Boeing has had its own abort engine issues with their capsule, both of them are trying to use liquid fuel engines. Apparently Apollo and Soyeuz both used/use solid-fuel rockets.
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Captain Ned
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Re: Space Thread

Sun Apr 21, 2019 6:37 pm

Kougar wrote:
Apparently Apollo and Soyuz both used/use solid-fuel rockets.

SpaceX and Boeing are trying to integrate the abort motors into the capsule. Apollo did, and Soyuz does still, use solids in an escape tower on the very pointy end, with this tower being jettisoned once tower abort scenarios were/are no longer in play.

The US has never had a real manned tower abort (last launch with an escape tower was Apollo/Soyuz in July 1975), while Soyuz has had at least 1.
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JustAnEngineer
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Re: Space Thread

Sun Apr 21, 2019 7:31 pm

Wikipedia says once on purpose (saving the crew) and once by accident on an unmanned capsule (killing a pad worker):
https://en.wikipedia.org/wiki/Launch_escape_system
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Mr Bill
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Re: Space Thread

Wed May 01, 2019 12:36 pm

nasa-finally-concludes-investigation-of-two-failed-launches-a-decade-ago
Combined, the loss of NASA's Orbiting Carbon Observatory and Glory satellites cost the space agency $700 million.

Over time, some information has come out. Shortly after the launches, it was clear the payload fairing had failed to separate from the two rockets. And in 2015, the company that supplied aluminum extrusions for the four-stage, solid-rocket Taurus XL booster, Sapa Profiles Inc. (SPI), admitted that it had falsified quality control test results for its products.
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Usacomp2k3
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Re: Space Thread

Thu May 09, 2019 5:51 pm

https://twitter.com/blueorigin/status/1 ... 85699?s=21

I don’t know how I feel about this. It is really hard to take Blue Origin seriously when they have basically nothing to show (beyond their hopper) for 10’s of billions invested in R&D.
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JustAnEngineer
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Re: Space Thread

Thu May 09, 2019 6:26 pm

Usacomp2k3 wrote:
It is really hard to take Blue Origin seriously when they have basically nothing to show (beyond their hopper) for 10’s of billions invested in R&D.
They do have an engine design good enough that the folks in the ULA military industrial complex decided to use it instead of buying engines from Russia.
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Usacomp2k3
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Re: Space Thread

Thu May 09, 2019 7:31 pm

Which has never seen use outside of a rear stand. I legitimately don’t understand the timing of ULA’s move other than to stop buying the RD-180’s
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drfish
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Re: Space Thread

Fri May 10, 2019 6:54 am

Of course this will be in shortbread next week but wow: https://arstechnica.com/science/2019/05 ... -in-space/

After reading Eric's writeup, I'm stoked. My money is still on SpaceX, but all the rest of the money is with Bezos and that counts for a lot. He's literally funding his childhood dream and I couldn't be happier that it aligns so closely with what I want to see started in my lifetime.

He watched the moon landing at 5 years old. I don't know what it's going to be yet but my daughter is going to get to see some kind of show when she's 5 too. So cool. Keep making access to space cheaper and things are going to get very exciting very quickly.
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Usacomp2k3
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Re: Space Thread

Wed May 15, 2019 11:12 am

The first Starlink launch is in 10.25 hours. It's pretty crazy how they fit 60 satellites into that fairing. Talk about vertical integration. I am very curious to see how long until they start accepting applications for beta testing. My in-laws would be great candidates.
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drfish
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Re: Space Thread

Wed May 15, 2019 11:23 am

Talk about something I'd love to review... :o
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MileageMayVary
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Re: Space Thread

Fri May 17, 2019 10:43 am

Usacomp2k3 wrote:
I am very curious to see how long until they start accepting applications for beta testing. My in-laws would be great candidates.


Launching the ashes of your In-Laws or your still very much alive In-Laws?
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Usacomp2k3
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Re: Space Thread

Fri May 17, 2019 10:49 am

MileageMayVary wrote:
Usacomp2k3 wrote:
I am very curious to see how long until they start accepting applications for beta testing. My in-laws would be great candidates.

Launching the ashes of your In-Laws or your still very much alive In-Laws?

:lol: That escalated quickly. They are very much alive.
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Mr Bill
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Re: Space Thread

Fri May 17, 2019 1:39 pm

It seems that the Plutonium in our local solar group is probably not produced by a supernova but rather by a Neutron Star Merger @Ars Technica. We are just "lucky" that the Actinides are more concentrated in our locality.

I had not realized there would still be iron on the surface of a neutron star.
Last edited by Mr Bill on Fri May 17, 2019 1:58 pm, edited 2 times in total.
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Mr Bill
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Re: Space Thread

Fri May 17, 2019 1:49 pm

Ah, here under the Structure Heading @Wikipedia - Neutron Star it says that the surface typically has lighter elements including iron. Also points out that due to gravity time dialation makes neutron star time slower. One might think then that actinides would decay more slowly. But I suppose being in a soup of ions, electrons, and neutrons @wikipedia Neutron Star might make predictions of stability somewhat... fluid.
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Mr Bill
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Re: Space Thread

Fri May 17, 2019 2:03 pm

Check out the video link for a Kilonova @Wikipedia.
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Usacomp2k3
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Re: Space Thread

Thu May 23, 2019 9:57 pm

Got a great shot from the beach tonight!

Image

PS, feel free to read my article on the front page about the launch. What a great time in the prep, writing, and experiencing!
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