In 1929, an astronomer named Edwin Hubble found that every single galaxy ... had stars that looked more or less the same color as the ones in the Milky Way. But beyond that, every galaxy looked ...

Edwin Powell Hubble is renowned for determining that there are other galaxies in the Universe beyond the Milky Way, and for observing that the universe is expanding at a constant rate. Hubble was ...

The Hubble constant is one of the most important numbers in cosmology because it tells us how fast the universe is expanding, which can be used to determine the age of the universe and its history. It ...