Four-Galaxy Collision

NASA's orbiting Chandra X-Ray Observatory snapped this shot of Stephan's Quintet, a group of five galaxies, four of which are currently in collision. Follow the link for a larger picture.


Previously on Neatorama:
The Hand of God
Smiley Face Galaxy

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buma, there are several ways to check that, one of the best ones is redshift - it's, roughly, a measure of distance along line of sight. If they have similar redshifts, then they are interacting.
You can look for signs of interaction - see that bright blue bumpy strip in the middle? that's star formation triggered by the interaction!

I do merger of galaxies for a living. any questions, please dont hesitate!
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