Simply put, a black hole is a region of space-time where gravity is so strong that nothing can escape from it. This includes light, which travels at the cosmic speed limit of 186,000 miles per second.

Astronomers determined in 1929 that the universe is expanding. This was one of the most important findings in science. In 1998, two separate groups of astrophysicists discovered that the universe’s ...

Before astronomy students at Columbia University can learn about about the sun, moon, and stars, they’ll have to take a refresher on … the “genocide” at Gaza? That’s the message from an undergraduate ...