Galaxy Cluster Abell 1689 Deflects Light

Saturday, April 11, 2015

Galaxy Cluster Abell 1689 Deflects Light

Galaxy Cluster Abell 1689 Deflects Light: APOD: 2013 September 17 - Galaxy Cluster Abell 1689 Deflects Light

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2013 September 17

See Explanation. Clicking on the picture will download the highest resolution version available.

Explanation: It is one of the most massive objects in the visible universe. In this view from the Hubble Space Telescope's Advanced Camera for Surveys, Abell 1689 is seen to warp space as predicted by Einstein's theory of gravity -- deflecting light from individual galaxies which lie behind the cluster to produce multiple, curved images. The power of this enormous gravitational lens depends on its mass, but the visible matter, in the form of the cluster's yellowish galaxies, only accounts for about one percent of the mass needed to make the observed bluish arcing images of background galaxies. In fact, most of the gravitational mass required to warp space enough to explain this cosmic scale lensing is in the form of still mysterious dark matter. As the dominant source of Abell 1689's gravity, the dark matter's unseen presence is mapped out by the lensed arcs and distorted background galaxy images. Surprisingly, close inspection of the above image has revealed the presence of over 100,000 globular star clusters in the galaxy cluster.

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Photos of Nature | Nature Photography What is The Universe

Photos of Nature | Nature Photography What is The Universe

Saturday, April 11, 2015