NASA’s Cassini reveals the mysteries of Saturn’s rings—and new hope for life on one of its moons.

Before it was a dry planet, Mars was a wet world that may have hosted life.

Mars was once a blue water world studded with active volcanoes. But when its magnetic field and protective atmosphere faded, it became the frozen desert planet we know today. With so many necessary elements in place, did life ever form on Mars?

Surprising evidence at the world’s oldest temple overturns our understanding of human history.

Explore the revolutionary engineering behind Paris’s iconic landmark.

Explore mammals’ surprising origins, long before the age of dinosaurs.

Do speech buttons really allow dogs to talk to us? Scientists investigate.

New evidence sheds light on the remarkable life – and mysterious collapse – of the ancient jungle city.

What if violent asteroid impacts actually jump-started life on Earth?

After decades in the shadows, UFOs are being studied seriously.