Before defining what a light-year is, we should define what a light-year is not: It is not a measure of time, but rather a ...

Could an Egyptian coffin, dated 5,000 years ago, hold the answer to one of the night sky’s greatest mysteries? University of ...

Scientists have detected the collision of two massive black holes merging beyond the Milky Way. The two black holes, each ...

For years, scientists have predicted that in about 3.75 billion years, our Milky Way galaxy would collide with its massive neighbor, the Andromeda galaxy. This cataclysmic event was thought to be a ...

Scientists predict up to 100 invisible galaxies may orbit the Milky Way, hiding just beyond our current detection limits.

A newly discovered ice comet from deep space may be over 7 billion years old, making it the most ancient comet scientists ...

New supercomputer simulations suggest the Milky Way could be surrounded by dozens more faint, undetected satellite ...

A newly discovered object from deep space may be the oldest comet ever observed—possibly more than 7 billion years old, and ...

In summer, we face toward the Milky Way's hub in the Teapot constellation, home to the galaxy's supermassive black hole.

Dark matter is one of nature's most confounding mysteries. It keeps particle physicists up at night and cosmologists glued to ...

Actor Pedro Pascal narrates the time-traveling journey through space at the American Museum of Natural History.

There may be many more satellite galaxies in the Milky Way than have been observed, according to new Durham University ...