At a Glance Astronomers were able to observe dying star turning into a black hole.The event may help explain why not all stars become supernovae when they expire.Questions remain about the origin of black holes. A dying star 25 times the size of our sun has likely been reborn as a black hole, giving astronomers key insights into the life cycles of supernovae and black holes. Instead of exploding in a massive supernova, the star instead fizzled out, leaving behind...

At a Glance The latest discovery shows these waves can be anywhere in the sky.Two black holes, which likely were originally far apart, eventually merged into a giant one, researchers say. Astronomers said Thursday they detected a third ripple in the fabric of space-time, a remnant of a cosmic crash of two black holes 3 billion years ago. These invisible ripples, called gravitational waves and first theorized by Albert Einstein, first burst into science's view to great fanfare in February...

A vast, deep pit found on Mars by a NASA orbiter defies explanation. ...