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Credit & Copyright: W. Couch (University of New South Wales),
R. Ellis (Cambridge University),
NASA
Explanation:
Gravity can bend light.
Almost all of the bright objects in
this Hubble Space Telescope image are galaxies in the cluster
known as Abell 2218.
The cluster is so massive and so compact that its
gravity bends and focuses the light
from galaxies that lie behind it.
As a result,
multiple images of these background galaxies
are distorted into faint stretched out arcs -
a simple lensing effect analogous to viewing distant street lamps through
a glass of wine.
The Abell 2218 cluster itself is about 3 billion light-years away
in the northern constellation Draco.
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NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: galaxy cluster - gravitational lens
Publications with words: galaxy cluster - gravitational lens
See also: