GOLDILOCKS would approve. It seems that dark matter – that stuff in the universe that we know is there but cannot see – is not too cold or too hot, but just right.
Astronomers at the University of Cambridge made detailed observations of 12 dwarf galaxies near the Milky Way to calculate how much dark matter must be holding them together. “No matter what size, how bright, or how many stars they contained, all the galaxies seemed to be sitting in roughly the same amount of dark matter,” says team member Mark Wilkinson. They found that dark matter clumps together in “building…
