amazing science/nature images

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TOS
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don't worry, we'll schedule it for when you're out of town
DEyncourt posted:
No pics for this (yet?), but....

Astronomers have been tracking a star in a relatively close orbit around the Milky Way's central black hole.

The star's complete elliptical orbit takes about 30 16 years. When it made its closest approach of about 120 AU or 18 B km (mind you: Neptune's orbit is only 30 AU/4.5 B km and takes 165 years to orbit around the Sun) this past May 19th, it was moving at about 8 K km/sec or 2.7% the speed of light relative to the black hole.

For size comparison: the Milky Way's central black hole is estimated to be about 4.5 M solar masses which would make its event horizon about 0.09 AU or 13.5 M km in radius or about 1/3rd the average distance between the Sun and Mercury.

I made a correction above.

Here's a couple of pic with linked explanations by the Bad Astronomer:

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The second graph shows the COMBINED red shift that was observed in this star during its closest approach to the Milky Way's central black hole. Even though the star was "only" about 18 B km from that black hole at its closest point, this red shift was increased because its light had to "climb out" of the black hole's gravity well.
TOS
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maurvir Steamed meat popsicle
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maurvir Steamed meat popsicle
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maurvir Steamed meat popsicle
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TOS
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fun fact: corgi bums are naturally buoyant

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TOS
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one dog herding a couple thousand sheep

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ukimalefu want, but shouldn't, may anyway
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juice Inadvertently correct
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It looks like there's another dog in the upper right.
dv
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TOS posted:
one dog herding a couple thousand sheep

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I see that and want there to be math.
TOS
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ukimalefu posted:
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here's the cheaper version:

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juice Inadvertently correct
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But much cuter!
user Stupid cockwomble
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juice posted:
It looks like there's another dog in the upper right.

maggots
ukimalefu want, but shouldn't, may anyway
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TOS
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Pithecanthropus Roast Master
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dv posted:
TOS posted:
one dog herding a couple thousand sheep

Image


I see that and want there to be math.

Tried counting. Fell asleep.
ukimalefu want, but shouldn't, may anyway
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I'd say around 300... ish
ukimalefu want, but shouldn't, may anyway
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ukimalefu want, but shouldn't, may anyway
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obvs Social Distancing Grandmaster
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ukimalefu want, but shouldn't, may anyway
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TOS
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user Stupid cockwomble
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time to feed up
TOS
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gravity eventually has her say

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TOS
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user Stupid cockwomble
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I'd pull that out with my teeth.
ukimalefu want, but shouldn't, may anyway
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ukimalefu want, but shouldn't, may anyway
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ukimalefu want, but shouldn't, may anyway
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macnuke Afar
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Feed me, Seymour!
ukimalefu want, but shouldn't, may anyway
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TOS
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juice Inadvertently correct
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That could have gone much differently.
Pithecanthropus Roast Master
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Ground is not supposed to do that. Yikes!
user Stupid cockwomble
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blackshirt gave warning
TOS
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jkahless Custom Title
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ukimalefu want, but shouldn't, may anyway
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amazing science/nature images

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