A 140-foot space rock, Asteroid 2007 EG, will pass relatively close to Earth soon. Scientists say it’s harmless, yet they’re watching carefully. Why does this flyby matter for future asteroid defence?

There is a category of planet that belongs to no star. It was thrown clear of its solar system early in the chaos of ...

SpaceX’s expanding Starlink constellation, now cleared by regulators for thousands of additional satellites, is drawing attention from researchers and entrepreneurs who see the infrastructure as a ...

Earth’s gravity has a lot to do with what people think is up and what is down. Things fall down toward the ground, but that ...