Studies of primitive stars suggest the universe has far too little of one form of lithium and far too much of another. But new work shows that the second problem might be nonexistent.

The Cat's Paw Nebula is home to many bright, young stars. But thousands of fainter stars concealed behind dust reveal themselves in a new infrared image.

The stars were not aligned when one of Sky & Telescope's editors signed up to ride NASA's Stratospheric Observatory for Infrared Astronomy.

Astronomers have discovered an unexpected class of variable stars in the open cluster NGC 3766. The stars are problematic for current theories of star behavior and raise perplexing questions about why the stars are variable at all.

Detailed observations of a young, nearby star are giving astronomers a chance to glimpse the Sun’s active youth.

A new study suggests that close-in gas giants may heat up electrically like toaster coils plugged in to their host stars via the power lines of the stellar wind — explaning why the planets inflate.

Spectacular high-resolution images released at the 222nd American Astronomical Society conference in Indianapolis reveal two of the Milky Way’s nearest galactic neighbors in a new light.

NASA's roving geology lab has been on Mars for 10 months, and scientists are finally preparing to send the rover toward its main objective: a towering mound of layered sediments inside Gale crater.

New observations with the powerful ALMA observatory reveal a huge pile-up of dust around a young star. The result could help astronomers solve a long-standing mystery in planet formation.

Thanks to a detector carried across interplanetary space aboard NASA's Curiosity rover, researchers now have a much clearer idea of radiation exposure that future astronauts will endure when traveling to and from Mars.

A recent annual meeting of amateur astronomers in Big Bear, California, proved once again that the amateur community is pursuing impressive science endeavors.

Mars Express celebrates a decade of orbital observations of the Red Planet.

In 2014 and 2016, Proxima Centauri will pass in front of two distant stars, potentially revealing details about itself and whether it hosts any planets in the process.

From international travel to interplanetary probes, the U.S. budget cuts are having impacts on both ground- and space-based astronomy.