(THE CONVERSATION) One of the most powerful objects in the universe is a radio quasar – a spinning black hole spraying out highly energetic particles. Come too close to one, and you’d get ...

These stars collapse upon themselves, creating dense cores known as stellar black holes—regions of space with gravitational forces so strong that not even light can escape. These phenomena are some of ...

It has front pockets to stash your stuff in and thumb holes that can be pulled over your thumbs for extra warmth. The zipper also has an elastic attachment that can be pulled off and used as a ...

Nail nick/thumb hole: A slit or hole in the blade that, similar to a thumb stud, lets you push the blade open with your thumb or thumbnail. Like a thumb stud, opening becomes smooth with practice ...