amazing science/nature images

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TOS
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Post by TOS »

don't worry, we'll schedule it for when you're out of town
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DEyncourt
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DEyncourt wrote: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:

Image

Image

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.
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TOS
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TOS
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Post by TOS »

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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juice
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Post by juice »

It looks like there's another dog in the upper right.
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dv
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Post by dv »

TOS wrote: one dog herding a couple thousand sheep

Image


I see that and want there to be math.
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TOS
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Post by TOS »

ukimalefu wrote: Image


here's the cheaper version:

Image
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juice
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Post by juice »

But much cuter!
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Post by user »

juice wrote: It looks like there's another dog in the upper right.

maggots
Aw, he's no fun, he fell right over.

Science is Truth for Life. In FORTRAN tongue the Answer.

...so I'm supposed to find the Shadow King from inside a daiquiri?
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TOS
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Post by TOS »

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Post by Pithecanthropus »

dv wrote:
TOS wrote: one dog herding a couple thousand sheep

Image


I see that and want there to be math.

Tried counting. Fell asleep.
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I'd say around 300... ish
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NSFW! NSFW!
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time to feed up
Aw, he's no fun, he fell right over.

Science is Truth for Life. In FORTRAN tongue the Answer.

...so I'm supposed to find the Shadow King from inside a daiquiri?
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TOS
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Post by TOS »

gravity eventually has her say

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dear god

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I'd pull that out with my teeth.
Aw, he's no fun, he fell right over.

Science is Truth for Life. In FORTRAN tongue the Answer.

...so I'm supposed to find the Shadow King from inside a daiquiri?
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Audrey l

People that do not succeed in politics usually tell the truth too often.

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Post by Warin »

Feed me, Seymour!
I'm sorry Dave...
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TOS
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Post by juice »

That could have gone much differently.
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Post by Pithecanthropus »

Ground is not supposed to do that. Yikes!
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Post by user »

blackshirt gave warning
Aw, he's no fun, he fell right over.

Science is Truth for Life. In FORTRAN tongue the Answer.

...so I'm supposed to find the Shadow King from inside a daiquiri?
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TOS
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Post by TOS »

Image
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Post by jkahless »

TOS wrote: Image


:awe:
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