World-renowned Greek astrophysicist Stamatios Krimigis says that a human settlement on Mars is a distant dream.

(NASA/JPL-Caltech via AP) Read full article: Venus passes between ... both NASA astronauts; and Mission Specialist Takuya Onishi from JAXA (Japan Aerospace Exploration Agency).

Venus will pass between the Earth and the Sun on Saturday in a rare event called an inferior conjunction, though it will be difficult to see without special equipment. This alignment occurs every 19 ...

As well as some of the darkest skies on the U.S. East Coast, it's also the nation's southernmost point. At 24.5 degrees north ...