Carl Sagan once said, “Exploration is in our nature. We began as wanderers, and we are wanderers still.” These words ...

NASA is edging toward a milestone it has not attempted in more than half a century: sending astronauts around the moon on a ...

Zipping toward Earth at around 20,000 miles per hour, the asteroid is due to make its closest approach on Tuesday.

Mars. From forming black holes to phantom dark energy, discover the cosmic mysteries astronomers uncovered last year.