Catch a glimpse of the Andromeda Galaxy as it hangs high in the October night sky. Late October presents a perfect ...

The Andromeda galaxy's approach toward the Milky Way is confirmed by its blueshifted light, indicating a velocity of 68 miles per second (110 kilometers per second). Over the past 2.5 million years, ...

This illustration shows the location of the 43 quasars scientists used to probe Andromeda’s gaseous halo. Quasars are extremely distant, brilliant cores of galaxies powered by star-eating black holes.

The Hubble Space Telescope has been snapping pictures of the universe for the best part of 35 years, and now astronomers have ...