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The Darkest Galaxies

By Marla Geha

In the past several years, fourteen Milky Way satellite galaxies have
been discovered, more than doubling the known population.  These newly
discovered ``ultra-faint'' galaxies have emerged as the least luminous
and most dark matter-dominated galaxies in the known Universe.   They
are dramatically reshaping our understanding of galaxy formation and
may hold the keys to deciphering the nature of dark matter.   I will
review our current understand of the ultra-faint galaxies, focusing on
the constraints these objects provide on dark matter.