A Meteorite Found in the Sahara Is a 4.1-Billion-Year-Old Piece of Mars

A Meteorite Found in the Sahara Is a 4.1-Billion-Year-Old Piece of Mars: Minerals in the space rock provide hints about the early history of the red planet, when water was flowing on the surface. By Kenneth Chang Reddish rocks found in the Sahara four years ago turned out to be older than almost anything on Earth. In fact, they are not of this world: They are