Space Exploration

Debris from spacecraft threatens the burgeoning space economy. We need a global agreement to keep space clean

Veteran spacefarer Don Pettit is set to launch this summer on a half-year mission to the International Space Station to perform novel science experiments, snap unique orbital photos, and much more

Sierra Space’s Dream Chaser is set to make its inaugural trip to orbit to deliver supplies to the International Space Station

Alien worlds that glow like lightbulbs or harbor molten-rock rain are revealing planets’ profound cosmic diversity—and pointing the way toward finding those that truly resemble our own familiar Earth

The far side of the moon holds the keys to the future of radio astronomy. We must maintain its pristine silence to benefit everyone

After the spectacular success of the first-ever “Marscopter,” mission planners have soaring ambitions for follow-up flying machines

Starliner’s first crewed launch will mark just the sixth time ever that NASA astronauts have flown in a brand-new spacecraft

The solar system’s outer limits aren’t as clear-cut as you might think

NASA scientists spent months coaxing the 46-year-old Voyager 1 spacecraft back into healthy communication

Millions of human-made objects travel at high speeds in low-Earth orbit, polluting space and increasing the chance of collision with satellites and other spacecraft

Facing budgetary pressure for its Mars Sample Return program, NASA has turned to private industry for ideas—perhaps with one specific company in mind

How long can humanity’s artifacts endure on the lunar surface? A new installation from artist Jeff Koons is inadvertently putting this question to the test