muddled up the minerals inside.]]> evidence gets erased.]]> examine rocks, and the rocks on Mars could tell us many things.]]> meteorite known as Northwest Africa 5298.]]> believe shergottites were formed by volcanoes about 150 to 250 million years ago.]]> crash or explosion melts the rock down.]]> landed on Earth after flying through space.]]> possible, said scientist Munir Humayun.]]> proved that the baddeleyites were young.]]> tough minerals are "10 times smaller than... a human hair," said scientist Axel Schmitt.]]>