Skip to main content

Posted by Specola

NASA Astronomy Picture of the Day:

Albert Einstein's general theory of relativity, published over 100 years ago, predicted the phenomenon of gravitational lensing. And that's what gives these distant galaxies such a whimsical appearance, seen through the looking glass of X-ray and optical image data from the Chandra and Hubble space telescopes. Nicknamed the Cheshire Cat galaxy group, the group's two large elliptical galaxies are suggestively framed by arcs. The arcs are optical images of distant background galaxies lensed by the foreground group's total distribution of gravitational mass. Of course, that gravitational mass is dominated by dark matter. The two large elliptical "eye" galaxies represent the brightest members of their own galaxy groups which are merging. Their relative collisional speed of nearly 1,350 kilometers/second heats gas to millions of degrees producing the X-ray glow shown in purple hues. Curiouser about galaxy group mergers? The Cheshire Cat group grins in the constellation Ursa Major, some 4.6 billion light-years away.

Read more from Pepe's Painting LLC

Snohomish, Skagit and Island County

Click the Image to learn more about us

SECURITY & SURVEILLANCE SYSTEMS - HOME AUDIO  425-379-7733

Powered by Volunteers | 360-794-7959

Giving Kids in Need the Chance to Read
  Non-profit organization - Seattle, WA

Read more from Kudos 365
Feedback