Earth's oldest discovered... on the Moon

Scientists have identified what they believe is the Earth’s oldest known rock - but revealed that it came from out of this world. Nearly 48 years after Apollo 14 returned from the moon with a cargo of collected rocks, geologists have established that at least one of them originated 20 km below the Earth’s surface. In a new study, they describe how they believe the two gram fragment was hurled into space during a massive asteroid strike around four billion years ago, subsequently stri