This article was originally published at Eos. The publication contributed the article to Space.com’s Expert Voices: Op-Ed & Insights. Earth froze over 717 million years ago. Ice crept down from

Moons may seem like quiet companions to the planets, but many of them are worlds every bit as fascinating as the planets themselves. Some are covered in oceans, some erupt

A total lunar eclipse will occur on March 3, creating a dramatic red “blood moon” for skywatchers across North America, Australia and East Asia. During the March lunar eclipse, totality