Using clever light-detecting techniques, ExTrA searches red dwarf stars for planets that might support life. By studying tiny ...

The United Nations says it has suspended its humanitarian operations in the stronghold of Yemen’s Houthi rebels after they detained eight more U.N. staffers. In a statement Monday, ...

The Quipu superstructure is enormous, spanning 1.4 billion light years – and it could violate one of our fundamental assumptions about the universe ...