On February 23, 2017, NASA announced a discovery that immediately captured the world’s attention. Using space-based telescopes, scientists had identified...

Earth—our blue planet—is the third rocky world from the Sun.It is a place that feels familiar, yet remains deeply mysterious....

When we look up at the night sky, it’s easy to forget just how overwhelming the numbers really are. Inside...

Humanity began observing the universe more than 5,000 years ago.When the ancient Greeks looked up at the night sky, they...