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Author Topic: Space Thread  (Read 121261 times)

Madman198237

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Re: Space Thread
« Reply #3075 on: April 05, 2019, 09:38:28 pm »

There is no "just jumping into it" in spacesuits. It literally takes hours to get suited up into one of those things.
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Starver

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Re: Space Thread
« Reply #3076 on: April 05, 2019, 10:06:09 pm »

Yes, when you're going to abandon your sort of Ok environment-inna-can for a planned period of swanning around in the somewhat less conducive expanses of space.

If/when your can clearly isn't going to do its job of delineating the two (and without a rather conspicuously busy Maxwellesque demon interfering, or a rogue Voyager probe returned with a heckova lot of assimilated capabilities, when things even out bestween the two it really won't do too much to improve the outside), there will be a plan of sorts, and even if it's not the First Immediate Action, some of the crew (depending upon precise circumstances and the options still open to to pursuit) may well be required to fast-track the suiting up process.

It is the fact that it rcannot be an option for everyone that I was commenting on, mainly.
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Trekkin

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Re: Space Thread
« Reply #3077 on: April 05, 2019, 10:10:47 pm »

Or maybe it's just not worth it given the number/proportion of scenarios where the emergency is basically so quick there's no chance at all of doing anything about it. Cost/benefit actuarial analysis doesn't justify the space and weight needed, so they only have two each of the US and Russian 'spacewalk' suits, and would rely on their individual limited-protection 'travel' suit for any very brief episodes of depressurised exposure protection (no real thermal maintenance or micrometeoroid-armouring)..

A more optimistic version of that thinking is operational practice, yes. The ISS moves around any debris big enough to track and is designed to withstand micrometeoroid impacts, and for everything between there's always two Soyuz to serve as storm cellars or lifeboats, putting abnormally high debris concentration in broadly the same boat as other bad space weather. That leaves just random chunks of debris in a very specific size range as the only way for the station to lose pressure without the astronauts already able to leave, and that's a constant but very unlikely hazard.
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Dorsidwarf

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Re: Space Thread
« Reply #3078 on: April 06, 2019, 12:28:17 am »

Yes, when you're going to abandon your sort of Ok environment-inna-can for a planned period of swanning around in the somewhat less conducive expanses of space.

If/when your can clearly isn't going to do its job of delineating the two (and without a rather conspicuously busy Maxwellesque demon interfering, or a rogue Voyager probe returned with a heckova lot of assimilated capabilities, when things even out bestween the two it really won't do too much to improve the outside), there will be a plan of sorts, and even if it's not the First Immediate Action, some of the crew (depending upon precise circumstances and the options still open to to pursuit) may well be required to fast-track the suiting up process.

It is the fact that it rcannot be an option for everyone that I was commenting on, mainly.

Putting a proper EVA suit on takes like a minimum of 15 minutes, with help from multiple people, on Earth, without the issues of microgravity or a trillion checks or the one-hour acclimatisation to the low pressure high oxygen atmosphere (which is the first thing you could skip in an emergency . It’s made of a whole bunch of smaller pieces, each of which is bulky as hell and you become increasingly restricted as you put more and more of it on.
Those interior flight suits which are vacuum rates but not space-rated probbably take less because they’re slim lined (but also not designed for leaving the vehicle at all) and are probbably what the crew put on in the case of a breach (Since I believe they’re stored in the Soyuz escape pods as they’re needed for re entry, and that’s where the crew go if there’s a problem with the main ISS
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Il Palazzo

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Re: Space Thread
« Reply #3079 on: April 10, 2019, 08:19:22 am »

First direct image of a black hole has just been released by the EHT team.
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Starver

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Re: Space Thread
« Reply #3080 on: April 10, 2019, 08:35:14 am »

Spoiler (click to show/hide)

More seriously., and then this, amongst others.
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Dorsidwarf

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Re: Space Thread
« Reply #3081 on: April 10, 2019, 10:54:19 am »

I'm still not entirely sure from media coverage whether this is a light-range picture or a radio telescope picture.
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Starver

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Re: Space Thread
« Reply #3082 on: April 10, 2019, 11:00:17 am »

"The Event Horizon Telescope (EHT) — a planet-scale array of eight ground-based radio telescopes forged through international collaboration — was designed to capture images of a black hole. (...)"

(For me, that site makes my browser go "Oh snap, something went wrong, click here to reload" after a few seconds, repeatedly, but I just persisted enough to copy the above and haven't tried to find out why. So maybe Caveat Browsor?)


Edit: Wikipedia summarises nicely (without crashing),
« Last Edit: April 10, 2019, 11:08:27 am by Starver »
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JoshuaFH

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Re: Space Thread
« Reply #3083 on: April 10, 2019, 11:02:49 am »

It says it's the "Shadow" of a black hole, and not the black hole itself?
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wierd

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Re: Space Thread
« Reply #3084 on: April 10, 2019, 11:18:34 am »

An event horizon does not emit detectable levels of light. Instead, the extreme curvature of space that is the horizon, bends the brilliant glare of the accretion disk in a very tight and precise way, which produces a dark void to be observed. This dark void is the shadow of the horizon caused by the lack of paths for light to take around the horizon.
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Starver

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Re: Space Thread
« Reply #3085 on: April 10, 2019, 11:23:27 am »

Depending on what you define as the black hole (with or without accretion disc, outside or inside the event horizon), it may not be possible to see the hole, by definition of what one is, but the shadow/silhouette or something similar is visible against its immediate hole-created surrounds.  Looking directly at the centre you'd see not much light from the matter yet to sufficiently fall inwards (and none from that which has) but as you view towards the sides you get an edge-on view of a wide swathe of that (actually, over the horizon, due to the gravitationally bent light-paths) so effectively you see "what it blots out", or its self-imposing shadow, of the especially 'glowing' material in its immediate vicinity.

Depends on how you want to describe it. It's a bit beyond everyday naked-eye observation, so it's not exactly an obvious thing to describe. "Shadow" sort of works, but maybe it's more akin to an Inferior Conjunction eclipse (the Moon blotting out the Sun) but... still not quite, because there's as much "sun" this side of the "moon" (and not even outshone!), yet the "moon" is the most significant party.

(Ninjaed by a more concise summary.)
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Il Palazzo

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Re: Space Thread
« Reply #3086 on: April 10, 2019, 11:55:48 am »

The shadow as it's used here has been defined precisely, though. It's the lensed image of the event horizon, approx. 2.5 times larger in angular diameter than the actual thing.
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LordBaal

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Re: Space Thread
« Reply #3087 on: April 10, 2019, 12:03:58 pm »

Did they found Bowman already?
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Starver

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Re: Space Thread
« Reply #3088 on: April 10, 2019, 12:35:49 pm »

This somewhat represents (from middle to one edge only, obviously you mirror for the other edge) where what you think you're looking at actually may be (somewhere along the 'parallel' path you choose, which might intersect with other such paths).


Bowman is in his hotel-room, watching TV.
« Last Edit: April 10, 2019, 12:37:31 pm by Starver »
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Max™

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Re: Space Thread
« Reply #3089 on: April 10, 2019, 03:09:36 pm »

Remember also that this is a 6 Gigasun object which has been horking down material long enough to hurl a jet of matter across thousands of light years, so the background glow around the shadow is matter screaming as it grinds together while whipping around an orbit wider than that of Neptune and it's doing it fast enough that you can see variations in the images they took, so we're talking fully out in deep relativistic effects land, super high percent of the speed of light type shit.
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