A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the ...

The northern sky's greatest galaxy gets its familiar name from the northern constellation where it resides, Andromeda the ...

Also known as M31, Andromeda is the Milky Way’s closest major galaxy, measuring roughly 152,000 light years across, with almost the same mass as our home galaxy. The younger James Webb Space Telescope ...

This is a wide-angle view of the distribution of known satellite galaxies orbiting the large Andromeda galaxy (M31), located 2.5 million light-years away. The Hubble Space Telescope was used to study ...

This is the largest photomosaic ever made by the Hubble Space Telescope. The target is the vast Andromeda galaxy that is only 2.5 million light-years from Earth, making it the nearest galaxy to our ...

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"Beyond the Milky Way lie billions of other galaxies, drifting a few million light years from one another like lily pads floating on the surface of a pond." — Timothy Ferris in Seeing in the Dark A ...