What's the size of the Milky Way galaxy? Learn how, depending on your definition, the size can change.

Our Milky Way is home to at least 17 billion planets that are similar in size to Earth, a new estimate suggests. That's more than two Earth-size planets for every person on the globe.Just how many are ...

The supermassive black hole named Sagittarius A* lies in the middle of the Milky Way. Observations of S2 and other stars also helped astronomers calculate the extraordinary size and mass of ...

We often think of our home galaxy, the Milky Way, as being a self-contained collection of stars, planets, gas and dust. Sure, it's going to slam straight into the neighboring Andromeda galaxy at some ...

The best time to view the Milky Way in the Northern Hemisphere is from March to September. The Milky Way, our home galaxy ...

Computer simulations and observations of nearby galaxies helped astrophysicists determine that the Milky Way stretches nearly 2 million light-years across, Ken Croswell reported in “Astronomers find ...

NASA's Hubble Space Telescope has captured a stunning new image of a galaxy that's over twice the size of our Milky Way. According to NASA, the gigantic elliptical galaxy (dubbed NGC 474) sits about ...

Hypervelocity stars have, since the 1920s, been an important tool that allows astronomers to study the properties of the ...

Freelance writer Amanda C. Kooser covers gadgets and tech news with a twist for CNET. When not wallowing in weird gear and iPad apps for cats, she can be found tinkering with her 1956 DeSoto. Most ...

The Milky Way galaxy, comprised of billions of stars, will be visible in the night sky until the end of May, particularly between the last quarter moon (May 20) and the new moon (May 30). Light ...

A new study shows how Milky Way chemical tracks emerge from shifting star formation and gas supply, reshaping ideas about the ...