by Staff Writers
Washington DC (SPX) Jun 21, 2012
The NASA/ESA Hubble Space Telescope has captured this view of the dwarf galaxy UGC 5497, which looks a bit like salt sprinkled on black velvet in this image. The object is a compact blue dwarf galaxy that is infused with newly formed clusters of stars.
The bright, blue stars that arise in these clusters help to give the galaxy an overall bluish appearance that lasts for several million years until these fast-burning stars explode as supernovae.
UGC 5497 is considered part of the M 81 group of galaxies, which is located about 12 million light-years away in the constellation Ursa Major (The Great Bear). UGC 5497 turned up in a ground-based telescope survey back in 2008 looking for new dwarf galaxy candidates associated with Messier 81.
According to the leading cosmological theory of galaxy formation, called Lambda Cold Dark Matter, there should be far more satellite dwarf galaxies associated with big galaxies like the Milky Way and Messier 81 than are currently known. Finding previously overlooked objects such as this one has helped cut into the expected tally - but only by a small amount.
Astrophysicists therefore remain puzzled over the so-called "missing satellite" problem.
The field of view in this image, which is a combination of visible and infrared exposures from Hubble's Advanced Camera for Surveys, is approximately 3.4 by 3.4 arcminutes.
Hubble at NASA
Space Telescope News and Technology at Skynightly.com
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Hubble Sees a Celestial Swan and Butterfly
Washington DC (SPX) Jun 13, 2012
This image from the NASA/ESA Hubble Space Telescope shows NGC 7026, a planetary nebula. Located just beyond the tip of the tail of the constellation of Cygnus (The Swan), this butterfly-shaped cloud of glowing gas and dust is the wreckage of a star similar to the Sun. Planetary nebulae, despite their name, have nothing to do with planets. They are in fact a relatively short-lived phenomeno ... read more
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