For sale: A 54-pound (25-kilogram) rock. Estimated auction price: $2 million to $4 million. Why so expensive? It's the ...

As wealthy buyers rush for these new collectibles, museums and universities risk turning into impotent onlookers ...

A rare lunar meteorite found in Africa sheds new light on hidden volcanic processes that shaped the Moon long after its surface was thought to have cooled. A 2.35-billion-year-old meteorite with a ...