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Astronomy Picture of the Day

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.

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

Stars Without Galaxies

Explanation: Galaxies are made up of stars, but are all stars found within galaxies? Using the Hubble Space Telescope , researchers exploring the Virgo Cluster of galaxies have now found about 600 red giant stars adrift in intergalactic space . Above is an artist's vision of the sky from a hypothetical planet of such a lonely sun. The night sky on a world orbiting an intergalactic star would be a stark contrast to Earth's - which features a spectacle of stars, all members of our own Milky Way galaxy . As suggested by the illustration, a setting swollen red sun would leave behind a dark sky flecked only with faint, fuzzy, apparitions of Virgo Cluster galaxies . Possibly ejected from their home galaxies during galaxy-galaxy collisions , these isolated suns may well represent part of a large, previously unseen stellar population, filling the space between Virgo Cluster galaxies.

Date March 27, 1999
Credit Credit: Illustrator J. Gitlin (STScI),
H. Ferguson (STScI), N. Tanvir (IoA), T. von Hippel (U. Wisc.), NASA
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.