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#926348 - 02/12/18 11:29 PM Pegasus the Winged Horse *revised*  
Joined: May 2010
Posts: 6,617
Mona - Astronomy Online content
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Mona - Astronomy  Online Content
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Tiger

Joined: May 2010
Posts: 6,617
United Kingdom

A flying horse on feathered wings - it's the constellation Pegasus. You can spot it by its most noticeable feature, the Great Square of Pegasus, though one star of the square belongs to poor Princess Andromeda. There's also a star in Pegasus very like our Sun with a planet circling it.

Pegasus the Winged Horse

NOTE: This article has been revised and updated.


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#926366 - 02/14/18 06:21 PM Re: Pegasus the Winged Horse *revised* [Re: Mona - Astronomy]  
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Mona - Astronomy Online content
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Tiger

Joined: May 2010
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Beautiful spiral galaxy NGC 7331 looks to be similar to our Milky Way. It's about 50 million light years away in the constellation Pegasus. In this image you can see dark dust lanes in the spiral arms, the tell-tale bright blue of clusters of massive young stars, and the reddish glow of star-forming regions. In the central region, the stars are yellow, showing they're older and cooler than those in the arms. Lurking in the center is a supermassive black hole, as in the center of our galaxy.

Image Credit & License: ESA/Hubble & NASA/D. Milisavljevic (Purdue University)


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#926381 - 02/15/18 10:01 AM Re: Pegasus the Winged Horse *revised* [Re: Mona - Astronomy]  
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Tiger

Joined: May 2010
Posts: 6,617
United Kingdom
The Sombrero Galaxy (M104) is in the constellation Virgo. But Pegasus has its Little Sombrero Galaxy (NGC 7814). Both sombreros are spiral galaxies seen edge-on, their shapes rather reminiscent of a broad-brimmed Mexican hat. NGC 7814 is about 60,000 light years across, so it isn't exactly little. In fact it's probably about the same size as M104, but looks smaller and fainter because it's farther away.

Image Credit & Copyright: CHART32 Team, Processing - Johannes Schedler

Last edited by Mona - Astronomy; 02/15/18 10:02 AM.

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#926400 - Yesterday at 06:59 AM Re: Pegasus the Winged Horse *revised* [Re: Mona - Astronomy]  
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Mona - Astronomy Online content
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Mona - Astronomy  Online Content
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Tiger

Joined: May 2010
Posts: 6,617
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What's going on in Pegasus? This curious picture shows galaxies colliding in Stephan's Quintet. They are the two spiral galaxies of NGC 7318, their clash created from Hubble images.
Quote
When galaxies crash into each other, many things may happen including gravitational distortion, gas condensing to produce new episodes of star formation, and ultimately the two galaxies combining into one. Since these two galaxies are part of Stephan's Quintet, a final round of battling galaxies will likely occur over the next few billion years with the eventual result of many scattered stars and one large galaxy.

Quite possibly, the remaining galaxy will not be easily identified with any of its initial galactic components. Stephan's Quintet was the first identified galaxy group, lies about 300 million light years away, and is visible through a moderately-sized telescope.


Image Credit: Hubble Legacy Archive, NASA, ESA; Processing & Copyright: Jose Jimenez Priego
Commentary: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)


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