Astronomers can estimate ages for stars outside the Solar System, but not planets. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. This article ...

At half the size of Earth and one-tenth its mass, Mars is a featherweight as far as planets go. Yet new research reveals the extent to which Mars is quietly tugging on Earth's orbit and shaping the ...

Mid-latitude valleys and crater floors on the Red Planet reveal swirling deposits from ancient glacial flows. When you purchase through links on our site, we may earn an affiliate commission. Here’s ...

Our species likes it cold. Homo sapiens evolved in — and still inhabits — one of Earth’s rare and fragile ice ages, periods distinguished not by an abundance of saber-toothed cats and woolly mammoths ...