Thundereggs look like regular rocks from the outside, but contain intricate and colorful mineral patterns inside — often made ...

Crystals inside a Martian meteorite hint that there may have been plentiful hot water on Mars when the rock formed 4.45 billion years ago. The rock, nicknamed Black Beauty, was blasted into space by ...

Everyone switched off their headlamps and there we stood together in total darkness, inside the San Gabriel Mountains. Yes, inside. I had joined a local caving group in an attempt to understand more ...