It’s said that our universe is filled with billions of galaxies. But how far away are they? Astronomers calculate galaxies’ distances by measuring their redshift. The most redshifted galaxies are said to be the most ancient and remote. But recently astronomers using the Hubble Telescope have observed galaxies that are too ancient—to close the the long-theorized Big Bang. The mystery is that these galaxies did not have enough time to create the structures we observe.
