To put that in perspective, the Earth is thought to be about 4.5 billion years old, which means these "rocks"—really bacterial biofilms (a sheet of bacteria only a few cells thick)—have been around a long, long time. Over the eons, these biofilms have piled up and calcified into forms that look like rocks called stromatolites.

Astronomers believe thousands of large undiscovered asteroids, that could cause regional damage, may be in space.

The Voyager probes are each turning off an instrument to avoid ending their 47-year-long missions later this year.

A new study suggests glaciers carved metals out from the Earth’s surface 700 million years ago, leading to chemical reactions in the oceans that set the stage for early animal evolution

Once, a very long time ago, a massive asteroid hit the Earth and wiped out the dinosaurs. In addition to functionally restarting land-based life on our planet and setting the stage for humans to eventually become the dominant species, that asteroid made us extremely aware of one thing—we are at risk.

President Trump wants rare-earth minerals deal to help the US recoup its support to Ukraine. He's said it's about 'raw earth.' What does that mean?