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Astronomy Picture of the Day -- Bright Spiral Galaxy M81
NASA ^ | October 17, 2015 | (see photo credit)

Posted on 10/17/2015 1:05:16 PM PDT by SunkenCiv

Explanation: One of the brightest galaxies in planet Earth's sky is similar in size to our Milky Way Galaxy: big, beautiful M81. The grand spiral galaxy can be found toward the northern constellation of the Great Bear (Ursa Major). This superbly detailed image reveals M81's bright yellow nucleus, blue spiral arms, tell tale pinkish star forming regions, and sweeping cosmic dust lanes with a scale comparable to the Milky Way. Hinting at a disorderly past, a remarkable dust lane actually runs straight through the disk, to the left of the galactic center, contrary to M81's other prominent spiral features. The errant dust lane may be the lingering result of a close encounter between between M81 and its smaller companion galaxy, M82. Scrutiny of variable stars in M81 has yielded one of the best determined distances for an external galaxy -- 11.8 million light-years. M81's dwarf companion galaxy Holmberg IX can be seen just above the large spiral.

October 17, 2015

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; m81; science
[Credit and Copyright: Ken Crawford (Rancho Del Sol Observatory)]

1 posted on 10/17/2015 1:05:16 PM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; steelyourfaith; Mmogamer; dayglored; ...
The Big One

2 posted on 10/17/2015 1:05:59 PM PDT by SunkenCiv (Here's to the day the forensics people scrape what's left of Putin off the ceiling of his limo.)
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To: SunkenCiv
remarkable dust lane actually runs straight through the disk

This dusty old dust is a-gettin' my home
And I got to be driftin' along.

3 posted on 10/17/2015 1:10:42 PM PDT by MUDDOG
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To: MUDDOG
That dust gets on my furniture too.
4 posted on 10/17/2015 1:21:42 PM PDT by MtnClimber (For views of Colorado scenery and wildlife, click on my screen name for my FR home page.)
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To: SunkenCiv

That’s beautiful. Definitely goes into my ‘backgrounds’ folder.


5 posted on 10/17/2015 1:29:01 PM PDT by Vic S
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To: SunkenCiv

It’s actually bright enough that it can be seen naked-eye from very dark places. So, it’s the furthest thing you can see without the aide of a telescope.

M31 (Andromeda) is the furthest you can see easily, but, that’s another story.

A beautiful sight in a scope. With the right lens, you can see both this and M82 in the same view.


6 posted on 10/17/2015 1:37:52 PM PDT by Conan the Librarian (The Best in Life is to crush my enemies, see them driven before me, and the Dewey Decimal System)
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To: SunkenCiv

Ooooh...that’s purty.


7 posted on 10/17/2015 1:48:14 PM PDT by Bloody Sam Roberts (Democracy is not freedom. Democracy is simply majoritarianism. It is incompatible with real freedom.)
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To: 60Gunner

For later viewing on a hi-def PC monitor.


8 posted on 10/17/2015 2:36:50 PM PDT by 60Gunner (The price of apathy towards public affairs is to be ruled by evil men. - Plato)
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To: SunkenCiv

God did that!


9 posted on 10/17/2015 3:30:33 PM PDT by theymakemesick (Democrats Lie Cheat Steal Destroy. Period. They are a filthy stain on Life and Freedom)
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To: theymakemesick

Isn’t that a given? It goes without saying. Yet, we manage to see postings related to ‘God’ in virtually every thread related to outer space.


10 posted on 10/17/2015 10:06:07 PM PDT by KoRn (Department of Homeland Security, Certified - "Right Wing Extremist")
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