A vast, flat sheet of dark matter may solve the long-standing mystery of why our neighboring galaxy Andromeda is speeding ...
It turns out that looming collision between our Milky Way and Andromeda galaxies might not happen after all. Astronomers reported Monday that the probability of the two spiral galaxies colliding is ...
The Milky Way was once a textbook example of how a spiral galaxy should form and evolve. Now a wave of new observations and simulations is forcing astronomers to admit that many of those origin ...