This suggests that something unseen — dark matter — is adding to the galaxy’s mass and keeping those stars from flying off into space.

they feel the effects of dark energy far more readily. So it makes sense to investigate the nature of this accelerated expansion where its influence is strongest. Breaking space news, the latest ...

As Douglas Adams wrote in The Hitchhiker’s Guide to the Galaxy, “Space is ... cluster in patterns: long filaments and two-dimensional sheets of galaxies in some areas; dark voids containing ...