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Author Topic: Space Thread  (Read 128770 times)

Il Palazzo

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Re: Space Thread
« Reply #2985 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 #2986 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 #2987 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 #2988 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 #2989 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 #2990 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 #2991 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 #2992 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 #2993 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 #2994 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 #2995 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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Bumber

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Re: Space Thread
« Reply #2996 on: April 10, 2019, 05:43:36 pm »

matter screaming as it grinds together
( ͡° ͜ʖ ͡°)
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Starver

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Re: Space Thread
« Reply #2997 on: April 11, 2019, 05:12:06 pm »

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Kagus

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Re: Space Thread
« Reply #2998 on: April 13, 2019, 09:03:32 am »

*brings back vivid KSP memories*
Bere-sheeit...

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Starver

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Re: Space Thread
« Reply #2999 on: April 14, 2019, 07:41:47 am »

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