Despite what you think, the Earth isn’t really the monogamous type. Along with the Moon, Earth has another moonlike companion ...

Could we be on the verge of finding a second Earth? Astronomers are searching the galaxy for a world that could support life ...

For years, a tiny space rock has been quietly following Earth on its journey around the Sun, hiding in plain sight as one of our planet’s mysterious cosmic companions. Now, for the first time, ...

Caitlin O'Kane is a New York City journalist who works on the CBS News social media team as a senior manager of content and production. She writes about a variety of topics and produces "The Uplift," ...