So when some apparently biological carbon was dated to at least 3.95 billion years ago —making it the oldest remains of life ...

The isotope samarium-146 decays into neodymium-142; this radioactive decay has been used to date moon rocks and Martian meteorites but had never been used on Earth rocks, O’Neil says.

The substance is green and radioactive, and it can cause immense damage to inhabitants of Krypton, the planet that Superman ...

Planetary scientists search for ancient impacts to learn about Earth’s early formation. So far, nobody has found an impact ...

The origins of plate tectonics on Earth are hotly debated, but evidence from Australia now shows that parts of the crust ...