NIAMEY, Niger - Officials in Niger are demanding an explanation after a rare Martian meteorite, unearthed by nomadic herders near the Ténéré Desert, was auctioned in New York for $4.7 million. The Ministry of Cultural Heritage claims the rock, named 'Ténéré-21,' was removed without authorization and represents a loss of both scientific and national significance. Sources say the meteorite is no ordinary space rock...