Far smaller and closer to the Sun than it should be, Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission arriving in 2026 might ...

A layer of diamonds up to 18 kilometers (11 miles) thick could be tucked below the surface of Mercury, the solar system's smallest planet and the closest to the sun, according to new research. The ...

The 2024 astronomical calendar is packed with events; And there's more to look forward to, despite the eclipse and auroras already having passed overhead. Nicknamed the "planet parade," a planetary ...