Arcturus (at a magnitude of -0.05), one of the few stars mentioned by name in the Bible, is a giant, about 25 times the ...

NASA's Perseverance rover captured Deimos, the smaller of Mars' two moons, shining in the pre-dawn sky over the Red Planet on March 1, 2025.

The quirks of light moving through gas are the cause of stellar twinkling, which can be a bane—and sometimes a boon—for ...

Analyzing gravity data collected by spacecraft orbiting other worlds reveals groundbreaking insights about planetary ...