ASTRONOMY

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.

The next supermoon will light up skies on Tuesday, February 19. This one will be a snow moon, a full moon that comes only at this time of year.

In 2004, the rover Opportunity landed on Mars. Originally intended to serve a mere 90-day mission, the rover instead beamed back scientific discoveries for more than a decade—and now its groundbreaking mission is over.

The mathematician laid the groundwork for technology we all use today.

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.

It's a question scientists have been asking for more than 400 years.

The letter may solve a centuries-long mystery.

The hapless dwarf planet got demoted in 2006, but some stubborn scientists are still lobbying for reinstatement.

Your education shouldn't end when you graduate.

The baby planet is a few times bigger than Jupiter.

From a 17-mile-long particle accelerator to a football field–sized space observatory, these machines are marvels.