Astronomers say that the Hubble Space Telescope has helped solve a cosmic mystery: why do the ancient dwarf galaxies on the outskirts of the Milky Way contain so few stars?
Our galaxy is surrounded by "ghost galaxies" -- which are faint clusters of stars that have barely changed in the last 13 billion years. However, sky surveys that only a handful of these galaxies exist (rather than the thousands that are predicted by theories), and they are starved of stars.
By: Mark Brown, Edited by: Duncan Geere
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via Wired.co.uk
http://www.wired.co.uk/news/archive/2012-07/11/hubble-ghost-galaxy-mystery
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