Stars are giant, luminous spheres of plasma. Galaxies consist of stars, stellar remnants, dust, gas, and dark matter, bound together by gravity. Learn more about stars and galaxies.
Long before the first confirmed planetary finds in the 1990s, an observer in 1917 caught evidence of planetary debris around a new star, new research into an astronomical glass plate reveals.
The new Milky Way video, which is set to the hit song "Stars" by Grace Potter, shows more than 500,000 stars in the densest, most massive cluster in the galaxy.
More than 2,300 scientists, teachers and journalists are in Florida this week for a conference dubbed "The Super Bowl of Astronomy." Keep up with the latest news via Space.com's complete coverage.
Pulsars are spherical, compact objects that are about the size of a large city but contain more mass than the sun.
Progress spacecraft are automated, unpiloted and single-use vehicles that typically deliver fuel and supplies to the International Space Station three to four times each year.
Most people will never have the experience of flying high over Earth in a spacecraft and seeing the planet's atmosphere, oceans and landmasses unspooling far below.