Venus, Mars, Jupiter, Saturn, Uranus, and Neptune were already visible in the night sky after dusk this month, but Mercury joined them on Feb. 28. While it's common to see a few planets line up in the ...

The noon Sun stands directly over Earth’s equator at 5:01 a.m. EDT on March 20. This point is the vernal equinox, or simply ...

A Fast-Moving Planet and a Crimson Moon! Catch Mercury if you can, then stay up late for a total lunar eclipse, and learn the truth about the dark side of the Moon.

"It's like a game of billiards around the solar system, flying by a couple of planets at just the right angle and timing to ...

A new study in the journal Nature Communications reveals that Mars is red for very much the same reason it may have once been ...

Mars may have once had a vast, ice-free ocean, according to new evidence from China’s Zhurong rover. Using ground-penetrating ...