Space Exploration

A dozen quasars in the early universe appear to have shut down in just a few years, baffling astronomers

Findings from NASA’s Cassini spacecraft suggests winter in Titan's southern hemisphere will be even colder than predicted

Scientists photograph a gas-giant exoplanet forming around a young star that lies about 450 light-years from Earth

What we know about alien worlds—and what’s coming next

The recently discovered small galaxy Leo P contains only about a hundred-thousandth as many stars as the Milky Way, but it's bucking the small galaxy trend by continuing to make new ones

A new explanation for the strange grooves on the surface of the martian moon Phobos suggests that the entire satellite already shows signs of how it will eventually be destroyed.

More than a hundred times as distant from the sun as Earth is, the object could be a pristine remnant from the primordial solar system

New Horizons reveals the orbits of Pluto's four smallest moons to be even more chaotic than expected

New Horizons mission finds evidence for cryovolcanism on the distant dwarf planet

New data from NASA's MAVEN mission reveals most of the Red Planet's atmosphere was stripped away

NASA astronaut Bill Shepherd recalls leading the first mission to the space station on November 2, 2000

The U.S.’s measly stockpile of plutonium is barely adequate for missions planned for the next decade