Add Yahoo as a preferred source to see more of our stories on Google. A photo taken in 1968 by astronauts aboard the Apollo 8 sparked the first-ever Earth Day. As I watched the Artemis II send back ...

Since the beginning of Earth's history, tiny particles of rock and metal from space have been hitting our planet. On clear nights, we can even see their traces as shooting stars. Trapped in layers of ...

Continental clues: Modern continental rocks carry chemical signatures from the very start of our planet’s history, challenging current theories about plate tectonics. Researchers have made a new ...