While Earth was famously hit by a meteor that killed off the dinosaurs, many others have also hit our planet, many of them leaving huge scars in their wake.

A strange shift in Earth's rotation is making our days milliseconds shorter — and scientists are racing to understand why. When you purchase through links on our site, we may earn an affiliate ...

Fifty-five years after the first Earth Day, climate activists organized a nationwide celebration of solar power. Fifty-five years after the first Earth Day, climate activists organized a nationwide ...