Where does stardust come from? It's been a long-standing mystery for scientists, but new research may get them closer to an answer.

"This is a whole sequence of planets that can give us insight into the evolution of planets... It's just a gold mine."

Called SS 433, the gamma-ray-generating system consists of a massive star in close orbit with what scientists think may be a black hole.

A newly-discovered massive star system, perhaps the first of its kind found in our galaxy, challenges existing ideas about how large stars eventually die.

The star may be from one of the first generations in the universe and suggests our galactic neighborhood could be billions of years older than we thought.

New evidence indicates that the two nearby galaxies smashed directly into each other a few hundred million years ago.