SPACE

He sat on his heliocentric theory of the universe for 30-some years, and only published his ideas on his deathbed.

It's our closest neighbor in the solar system, but we still have a lot to learn about the Moon—from how it formed to what's on its dark side.

Galileo Galilei, the father of modern astronomy, probably never dropped anything off the leaning tower of Pisa, and he didn't actually invent the telescope. But he did change history with his discoveries about the cosmos.

Though it's freezing on its surface, primitive life might be lurking somewhere below.

Over the course of his life, Aldrin has learned a lot, and he’s shared his wisdom in a number of books and interviews.

From the first manned Moon landing to Monty Python, here are 50 things marking a half-century on this planet (and beyond).

They formed when a crater hit the spot 15 million years ago.

Eris was once thought to be larger than Pluto.

Don't miss one of the best meteorological events of the year: The Geminid meteor shower is famous for its bright, frequent shooting stars.

NASA was officially established in October 1958. Just two years later, the agency started what would become one of the defining programs of the 20th century—Apollo, which put humans on the moon in 1969.

Some insects act differently during an eclipse. Bees are one of them.

America's preeminent badass astrophysicist turns 60 years old today.