What Is a Black Hole?

What Is a Black Hole?

A black hole is one of the most mysterious and extreme objects in the universe. It is a region in space where gravity is so strong that nothing—not even light—can…
Why Is Space Black?

Why Is Space Black?

When we look up at the night sky, away from city lights, we see stars shining in the darkness. But despite the countless stars and galaxies in the universe, space…