The object dubbed Earth's "second moon" is actually a quasi-satellite that's accompanied the planet since 1957 — not a true ...

Earth’s atmosphere is slowly leaking into space, and new research shows some of it reaches the Moon, where it may be ...

Skygazers who look up at the moon tonight may be able to spot Saturn below it. Here's when and how to spot the conjunction.

"In our solar system, the most massive moon is Ganymede, which is still extremely small compared to what we are inferring ...

Primordial black holes could rewrite our understanding of dark matter and the early universe. A record-breaking detection at ...

Elon Musk appears at Davos for the first time, speaking on stage at World Economic Forum in Switzerland. Speaking directly with co-host Larry Fink, Elon says self-driving is basically solved, pointing ...

Scientists have discovered over 6,000 planets that orbit stars other than our sun, known as exoplanets. More than half of ...