Galaxy-X is about 260,000 light-years from here. It’s dominated by dark matter and is 1 percent the mass of our Milky Way galaxy, but still ranks third largest out of our galaxy’s satellite friends.
Dark Matter Galaxy-X Hiding Out There, Scientists Predict
Galaxy-X is about 260,000 light-years from here. It’s dominated by dark matter and is one percent the mass of our Milky Way Galaxy.

The distribution of cold atomic hydrogen gas in the Whirlpool Galaxy (M51) extends far beyond the visible stars in the galaxy and its satellite NGC 5195 (marked by cross), which is situated in the short arm of the spiral. Analysis of perturbations in the in the hydrogen distribution can be used to predict the location of such satellites, in particular, those satellites that are composed primarily of dark matter and are thus too faint to be detected easily. Sukanya Chakrabarti/UC Berkeley
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