The recently discovered galaxy 'Segue 1' orbits the Milky Way, and is believed tobe composed of mainly dark matter
The Daily Mail:
A satellite galaxy made almost entirely of dark matter could be orbiting the Milky Way, a new image has revealed.
It is one of 24 neighbouring galaxies spotted by the Sloan Digital Sky Survey, which has recorded the night sky in greater detail than ever before.
The results have doubled the number of known dwarf galaxies orbiting the Milky Way.
The latest finding is particularly significant as it appears to have a very low light-to-mass ratio - a billion times less bright than the Milky Way itself.
Yale Professor of Astronomy Marla Geha, who led the team that made the discovery, believes that the galaxy, named 'Segue 1' is mainly composed of dark matter.
The scientists studying the galaxy believe this is due to the fact that despite having a mass of a million suns, it is not nearly as bright as it should be.
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