A new study using data from NASA's Hubble Space Telescope finds that star formation in the nearby Andromeda galaxy has undergone a 500-million-year decline, with an even steeper drop in the last 40 ...

The two keys to Edwin Hubble 's breakthrough discovery were forged by others in the 1910s. The first key, the period-luminosity scale discovered by Henrietta Leavitt, allowed astronomers to calculate ...

Hubble’s detailed portrait of Andromeda revealed hundreds of millions of stars, hidden debris streams, and signs of ancient ...

A new composite image of the Andromeda Galaxy is offering an unprecedented view of our closest spiral galactic neighbor. Composed by NASA and international space partners, the image combines data from ...

The observations that American astronomer Edwin Hubble made on the night of October 5-6, 1923 and one that he had made the ...

Add Yahoo as a preferred source to see more of our stories on Google. A beautiful white and blue spiral galaxy is seen slightly edge-on with a vast black section of space behind it. There are glowing ...

Our nearest large galactic neighbor has been going quiet for half a billion years — and a new study published Monday in The Astrophysical Journal has now mapped that silence, star by star, across ...

Add Yahoo as a preferred source to see more of our stories on Google. Credit: Gianluca Masi, Virtual Telescope Project, Background: NASA, ESA and the Hubble Heritage (STScI/AURA)-ESA/Hubble ...

The Andromeda galaxy, left, is about to collide with part of the Milky Way, as seen from Earth, in a hypothetical merger scenario. Credit: NASA illustration "Based on the best available data, the fate ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. When will the Milky Way collide with the Andromeda Galaxy?