This video is based on recent findings made by astronomers using the Chandra X-Ray Observatory and the Rossi X-Ray Timing Explorer of a pulsing "heartbeat" coming from the binary star-black hole system GRS-1915.

What would happen if you crossed paths with a black hole? Nothing good, that's for sure. Here are two popular theories about how exactly a black hole would kill you.

How heat and light are produced by fusion reactions inside the sun, and how they exit its surface and travel across the solar system.

The NASA/ESA Hubble Space Telescope -- with a little help from an amateur astronomer -- has produced one of the best views yet of nearby galaxy Messier 106, a striking spiral galaxy with a number of secrets.

Find out what astronomers have been learning when they look deep into the core of giant galaxies. In nearly every one, they are turning up supermassive black holes that are tearing space to shreds, blasting away at their environments, and raging against the relentless force of gravity that create...