Solar system

The moon is Earth’s constant companion. But will that always be the case?

The evidence is mounting: this interstellar visitor is even older and weirder than anyone thought

Next summer, NASA’s Lucy spacecraft will start sidling up to several asteroids near Jupiter. On its way there, it has studied another space rock up close

SpaceX’s IPO—the largest in history—has out-of-this-world implications for AI, space commerce and extraterrestrial exploration

Meteor camera networks can reveal the hidden history of the solar system, and you can assist from your own backyard

Hints of high-pressure chemistry within a rare meteorite suggest this fallen space rock comes from a planet gone wrong in the solar system’s early history

NASA ordered its astronauts to take refuge inside a docked SpaceX Crew Dragon spacecraft and to prepare for potential evacuation of the International Space Station. But the crew returned to normal operations shortly afterward

At an event at NASA Headquarters, space agency officials unveiled the first rovers and landers headed to the future site of its planned lunar south pole outpost

Our galaxy and its nearest large companion, Andromeda, may be headed for a collision on a cosmic scale. What happens then?

The asteroid will swing by Earth on Monday and be close enough to be visible using an amateur telescope

The rare isotope helium-3 is one of Earth’s most precious commodities—so precious, in fact, that it might prove profitable to mine from the moon

NASA’s moon exploration plans call for nearly 80 launches, nearly 75 landers, 10 moon buggies and one nuclear reactor