Astronomers discover giant cosmic sheet around the Milky Way

Nearly a century ago, astronomer Edwin Hubble discovered that almost all galaxies are receding from the Milky Way. This observation became a cornerstone of modern cosmology because it provided key evidence that the universe is expanding and that it began with the Big Bang. Even during Hubble's era, however, astronomers knew the pattern was not universal. One notable exception is our neighboring galaxy Andromeda, which is moving toward the Milky Way at roughly 100 kilometers per sec...