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Author Topic: Space Thread  (Read 509609 times)
Surlyboi
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eat a bag of dicks


Reply #245 on: November 09, 2014, 05:16:11 PM

Apparently, the computer modeling that was done to simulate a black hole's event horizon and the accretion disk around it has led to some actual astrophysical breakthroughs about what black holes look like and how they behave.

http://www.wired.com/2014/10/astrophysics-interstellar-black-hole/

Tuned in, immediately get to watch cringey Ubisoft talking head offering her deepest sympathies to the families impacted by the Orlando shooting while flanked by a man in a giraffe suit and some sort of "horrifically garish neon costumes through the ages" exhibit or something.  We need to stop this fucking planet right now and sort some shit out. -Kail
ajax34i
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Reply #246 on: November 09, 2014, 08:15:34 PM

That makes sense to me; the distortion with a neutron star is such that you can see the surface details of both geographic poles at the same time, so it makes sense that with a black hole you can see past both poles and all the way to the far side, so yeah the accretion disk would look like that (though I'd imagine a bit narrower at the top and bottom due to perspective).
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Reply #247 on: November 10, 2014, 08:16:17 AM

It'll depend on the angle.  It'll still warp everything, but the disk in front will be anything from edge on to perpendicular, so the warped light will be altered to.  They alluded to that briefly in talking about limiting shots to interesting angles.

Hahahaha!  I'm really good at this!
calapine
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Reply #248 on: November 11, 2014, 04:02:04 PM

PSA post for anyone interested (or bored at work) in the landing. The live-stream for the landing tomorrow (12. Nov) is already up, at the moment it's very quiet control center there though...


Event times tomorrow:

UTC 09:03 / CET 10:03 / EST 04:03 - Philae separation

UTC 16:02 / CET 17:02 / EST 11:02 - Expected landing





« Last Edit: November 11, 2014, 04:11:56 PM by calapine »

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Reply #249 on: November 12, 2014, 01:59:42 AM

+++ Philea ejected at UTC 08:35 +++


Some problems: The cold gas thruster on top of Philea that's supposed to prevent the lander from bouncing of is not working, so it depends on the harpoons and the three ice screws to hold it in place...


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Lucas
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Reply #250 on: November 12, 2014, 02:24:38 AM


" He's so impatient, it's like watching a teenager fuck a glorious older woman." - Ironwood on J.J. Abrams
apocrypha
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Reply #251 on: November 12, 2014, 03:02:19 AM

I'm totally going to be watching the livestream out of the corner of my eye all day.

Edit: It must be kind of odd to be working there right now, when it's really quiet, not much going on... and yet 150,000 people are watching you live.  swamp poop
« Last Edit: November 12, 2014, 03:05:34 AM by apocrypha »

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calapine
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Reply #252 on: November 12, 2014, 08:47:16 AM

Soon! ™


Last image of Philae:



-- The boom pointing downwards belongs to ROMAP the magnetormeter / plasma monitor.

-- The two little antennas are the dipols of CONSERT (COmet Nucleus Sounding Experiment by Radiowave Transmission). Rosetta has a similar instrument which will send a signal when on the other side of the comet, which is picked up by Philiea. Changes in wave propagation then give an insight into the comets interior makeup.

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Lucas
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Reply #253 on: November 12, 2014, 08:51:35 AM

Space bus! (or mailbox)

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calapine
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Reply #254 on: November 12, 2014, 09:41:25 AM

Landed!



The control center went from cheering ""Touchdown. There is telemetry coming." to very tense "This one is not going down. The elevation is not going down." to to very relieved "It's going down." within the span of 3 minutes.

Public relations is rather good this time too. Rosetta and Philea have their own twitter rolleyes. Pretty sure that anthropomorphizing spacecrafts is a trick ESA learned from her big sister across the pond.  Grin



Edit 17:56: Oh, FFS. Very soft touchdown, ice drills only sunk in around 4 cm. Harpoons did NOT fire. Lander might be moving slightly.

Please.....  Ohhhhh, I see.
« Last Edit: November 12, 2014, 09:56:07 AM by calapine »

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Reply #255 on: November 12, 2014, 10:12:10 AM

Briefing on DLR right now, transcribing...

Good news:

--- Touchdown, all the signals that trigger on touchdown worked.

--- Still communication, which means the lander did not tilt or topple.


Bad news:

--- ADS thruster did not fire, that is the issue was already known beforehand.

--- The anchors did not fire, this confusion was due to the rewind motors for the anchors going into action, but the harpoon wasn't actually fired.

--- Team doesn't know if it rebounded or not / if it's on the surface. Thus they don't dare issuing a re-firing signal for the harpoons, because they don't know in what position the lander is.


Current Situation:

--- The arm that damped the landing force only moved very little, which indicates a very soft surface. Which might mean if it rebound the rebound was very soft as well and in this case might settle down again.

--- On board computer is waiting for new commands.

--- There will be more telemetry in 30 minutes, but contact lost in 120 minutes, so the final verdict could be known only tomorrow.
« Last Edit: November 12, 2014, 10:14:49 AM by calapine »

Restoration is a perfectly valid school of magic!
pxib
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Reply #256 on: November 12, 2014, 11:07:04 AM



This image, taken over somebody's shoulder, is kicking around on Twitter.

EDIT: ...but this one, taken by Philae from 3 kilometers away, is definitely legit. They are receiving pictures:
« Last Edit: November 12, 2014, 11:17:24 AM by pxib »

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Reply #257 on: November 12, 2014, 11:19:31 AM

This image, taken over somebody's shoulder, is kicking around on Twitter.

Higher-res version now available:


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Reply #258 on: November 12, 2014, 01:18:48 PM

So, the take-away is that there will be no further information until tomorrow.


Stephan Ulamec (Head Philea Lander, German Aerospace Center) gave following interpretation of the telemetry data at the last press conference:


1) Initial touchdown confirmed.

2) Anchoring harpoons did not fire – Lander not anchored to the surface.

3) Fluctuations in the radio link observed. Those fluctuations showed some degree of regularity.

4) Additionally fluctuations in the solar power generator have been measured.

5) Take together this could indicate that the lander touched off again and started to rotate.

7) Some science data received also pointed towards this interpretation.

8) After two hours the fluctuation of the solar generator stopped. This indicates that the lander touched down again. Quote: “We landed twice!”

Restoration is a perfectly valid school of magic!
apocrypha
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Reply #259 on: November 13, 2014, 01:52:21 AM

Here's the path that Rosetta took over the last 10 years:


If you've ever played Kerbal Space Program then you'll probably be really impressed by that  awesome, for real

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calapine
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Reply #260 on: November 13, 2014, 02:26:16 AM

Yep. I looked it up to get some comparison, and Rosetta's journey has been the distance of traveling to the Sun and then back. Times 22x!  ACK!
« Last Edit: November 13, 2014, 02:29:01 AM by calapine »

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HaemishM
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Reply #261 on: November 13, 2014, 08:56:45 AM

That animated GIF of the path is just incredible. It kind of hits home that space travel isn't about a point A to point B journey. Using the gravitational pull of different celestial bodies to slingshot through differing arcs is amazing. I'm assuming they did that to save time and fuel.

Viin
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Reply #262 on: November 13, 2014, 10:25:11 AM

That last slingshot is freakin' awesome.

- Viin
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Reply #263 on: November 13, 2014, 11:00:23 AM

It amazes me that from what appears to be that 'little' distance out there in deep space where it shut off and turned back on was ~3 years long.

Does any one know where the love of God goes...When the waves turn the minutes to hours? -G. Lightfoot
Trippy
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Reply #264 on: November 13, 2014, 01:08:33 PM

Philae bounced twice (landed three times) and is now mostly in the shadows preventing proper charging of its batteries.

http://www.theguardian.com/science/2014/nov/13/philae-lander-tight-spot-comet-tough-decisions-esa-rosetta


ajax34i
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Reply #265 on: November 14, 2014, 02:57:45 AM

That GIF has accurate orbits for the planets (esp. visible with Mercury) rather than just circles, and accurate time; Earth going around the Sun 3 times = 3 years, by definition.
Shannow
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Reply #266 on: November 25, 2014, 11:53:32 AM

Space X to land their Falcon booster on a drone ship at sea.

I think they are just going for a better degree of difficulty score now.

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Reply #267 on: November 25, 2014, 02:03:00 PM

Space X to land their Falcon booster on a drone ship at sea.

I think they are just going for a better degree of difficulty score now.
There is a logic to it, this is a drone booster stage, there's no point in risking lives on the recovery vessel. The wave compensation and station-keeping would all be automated anyway, having a crew on board would be redundant.

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Reply #268 on: November 25, 2014, 04:36:47 PM

It is very interesting, and will be an amazing achievement if they manage to land it successfully.  If they can consistently start to land and reuse rocket booster stages, will be a pretty big game changer as far as cost of space flight goes.  Even if it fails, it's really neat to see companies trying something new.

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Reply #269 on: November 26, 2014, 01:29:11 AM

It's kind of a 'DUH' type of engineering concept.  Really, all the main stage is doing is saving just enough fuel to slow decent.  The rocket can be gyroscopically and/or aerodynamically stabilized on the way down (after transiting to subsonic); the only thing left to do being to fire the main engines again with enough time to decelerate.  There's 80% less mass at that point, so the logic is obvious.

https://www.youtube.com/watch?v=uIlu7szab5I

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jakonovski
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Reply #270 on: November 26, 2014, 01:44:20 AM

calapine
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Reply #271 on: November 26, 2014, 06:28:00 AM


Quote
Brandenburg is a former consultant on Space Missile Defence and Directed Energy Weapons and is currently holding post as researcher at Orbital Technologies in Madison Wisconsin.

So he is not crazy he is doing a sales pitch. rolleyes rolleyes
« Last Edit: November 26, 2014, 06:29:57 AM by calapine »

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HaemishM
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Reply #272 on: November 26, 2014, 10:53:34 AM

Were the nukers led by Xenu?

Lucas
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Reply #273 on: December 05, 2014, 04:40:32 AM

Livestream for the first Orion unmanned flight test (go in about 20 minutes):

http://www.nasa.gov/multimedia/nasatv/index.html#.VIGaIzGG98E

edit 1: ALL SYSTEMS GO  DRILLING AND MANLINESS

edit 2: SUCCESS!!  Heart awesome, for real DRILLING AND MANLINESS

Looking at the Earth Curvature and atmosphere layer taking shape is always mesmerizing  Heart
« Last Edit: December 05, 2014, 05:14:09 AM by Lucas »

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calapine
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Reply #274 on: December 25, 2014, 10:35:32 AM

The Russian Angara-5 made it's maiden launch just before Christmas (23rd.)






I find the pictures awesome from a pure aesthetic perspective. The snow snow creates such a cold (duh!) and alien atmosphere. Almost if from another planet. (If that makes sense?  Head scratch)

Edit: As for the rocket itself: It supposed to be a long-term replacement for the Proton and give to Russia greater independence from the Baikonur launching site. Main cargo will be heavy military satellites, but the official plan is to stabilize the cost by the 10th start so that a commercial offering is viable as well. Payload for GTO is 5.4 t.
« Last Edit: December 25, 2014, 11:20:12 AM by calapine »

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Reply #275 on: January 16, 2015, 11:35:26 AM

Elon Musk is tweeting out photos of the Falcon X missing the landing from the other day (while doing a twitter session with John Carmack of all people)

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Reply #276 on: January 16, 2015, 11:50:40 AM

"Next rocket landing on drone ship in 2 to 3 weeks w way more hydraulic fluid. At least it shd explode for a diff reason."   awesome, for real

Thanks, I meant to post about this earlier, but Polish ear worms got in the way.  It was a damn impressive first attempt, and looks like they almost got if not for the hydraulic fluid issue.  The next launch is going to be interesting.
Elon Musk is tweeting out photos of the Falcon X missing the landing from the other day (while doing a twitter session with John Carmack of all people)
Carmack is a big rocket guy (as I'm sure you know).  They had a twitter discussion a few weeks before this launch where each was debating their own idea on the best way to get the rocket back down.  The results from this seem to have mostly vindicated Elon (as Carmack admits in the tweets).  Lots of awesome rocket stuff going on lately, I love it.  Really looking forward to seeing how the first launch of the Falcon Heavy goes.

Also I learn a new (to me, I'm sure its ancient) engineering term.  RUD.   awesome, for real

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Shannow
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Reply #277 on: January 16, 2015, 01:14:52 PM

lol RUD. I think I may have to start using that in everyday life.

Must admit I'm fucking pumped to see how the second launch and landing goes!

Someone liked something? Who the fuzzy fuck was this heretic? You don't come to this website and enjoy something. Fuck that. ~ The Walrus
Viin
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Reply #278 on: January 16, 2015, 01:27:38 PM

Musk is a funny guy. I'm glad to see he's using his fortunes for something worthwhile even if he ultimately hopes it makes boat loads of money in the end.

- Viin
pxib
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Reply #279 on: February 12, 2015, 11:15:17 AM


(link to high resolution)

Rosetta's pictures continue to be stunning and only promise to improve as the comet gets closer to the sun.

Also we're getting great photos of Ceres, with much closer ones available starting next month, and the Pluto flyby this June.

It's a good year for tiny, icy planetoids.

if at last you do succeed, never try again
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