In a path-breaking discovery, scientists have spotted the largest-ever planet-forming disk - officially called IRAS 23077+6707 - nearly 1,000 light-years away from Earth. When the scientists ...

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?