The galaxy that’s missing its dark matter NASA/ESA/P van Dokkum
There’s a strange galaxy in the distant universe and it’s missing something big: dark matter. At the edges of most galaxies, stars orbit so quickly that they should be flung away. The fact that they don’t implies that these galaxies have far more mass than we can see, and the gravity of that extra mass – dark matter – holds them together.
Some galaxies are up to 99.8 per cent dark matter, says Pieter van Dokkum at Yale University. But he and his colleagues found one that has…
