Astronomers Detect a Tiny Dwarf Galaxy That Has Way More Dark Matter Than We Expected – ScienceAlert

A tiny, ancient dwarf galaxy named Tucana II orbiting the Milky Way has been harbouring a big secret. According to a new study of stars around the object, gravitationally bound to it at great distances, its dark matter halo is a lot more massive than we thought.
In fact, it’s absolutely huge. Although the stellar mass of Tucana II is around just 3,000 times the mass of the Sun, its dark matter halo clocks in at 10 million times the mass of the Sun. That’s around three to five times more massive…

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