The Boomerang Nebula Pgc 3074547
by Science Source
Title
The Boomerang Nebula Pgc 3074547
Artist
Science Source
Medium
Photograph - Photograph
Description
This NASA/ESA Hubble Space Telescope image shows a young planetary nebula known (rather curiously) as the Boomerang Nebula. It is in the constellation of Centaurus, 5000 light-years from Earth. With a temperature of -272C, it is only 1 degree warmer than absolute zero (the lowest limit for all temperatures). It is the only object found so far that has a temperature lower than the background radiation. The rapid expansion of the nebula has enabled it to become the coldest known region in the Universe. The image, taken in 1998, was exposed for 1000 seconds through a green-yellow filter. The light in the image comes from starlight from the central star reflected by dust particles.
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July 7th, 2014
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