Centuries before other galaxies were known to exist, astronomers called them “spiral nebulas.” Today the defunct term still ...

Vesto Melvin Slipher was born on a farm in Mulberry, Indiana, on Nov. 11, 1875. He graduated from high school, taught briefly ...

"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 ...

This is the largest photomosaic yet assembled from Hubble Space Telescope observations. It is a panoramic view of the Andromeda galaxy, located 2.5 million light years away from Earth. This mosaic ...

The Andromeda galaxy helped Edwin Hubble settle a great debate in astronomy. Stocktrek Images via Getty Images A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known ...

The Andromeda galaxy is the galaxy next door, a very faint, fuzzy thing in the night sky, larger than a full moon. Textbooks claim it’s visible to the naked eye. Most of us have never noticed it. Too ...

Michael Bakich selected visually stunning celestial objects observed through telescopes, including Omega Centauri, the 2010 total solar eclipse over Easter Island, Thor's Helmet nebula, and the Jewel ...

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