A decade of observations by NASA’s Hubble Space Telescope has produced the sharpest and most detailed images of the Andromeda ...

The Andromeda galaxy is the galaxy next door, a very faint, fuzzy thing in the night sky, larger than a full moon. Textbooks ...

How did a Cepheid variable star help Edwin Hubble prove the Andromeda Nebula was a galaxy? Roger BradySan Quentin, California Cepheids are rare variable stars with periods ranging from about 1 to 120 ...

Astronomers deployed the Hubble Space Telescope over the course of a decade to conduct 600 separate observations to produce ...