By Andrea Shalal WASHINGTON (Reuters) - Space Exploration Technologies, or SpaceX, has slammed a bid by United Launch Alliance, a joint venture of Lockheed Martin Corp and Boeing Co, to get a waiver from a U.S. ban on Russian rocket engines for military use. Elon Musk, the billionaire founder of Tesla Motors and chief executive of SpaceX, told Defense Secretary Ash Carter that federal law already allowed ULA to use "a substantial number" of engines.
By Will Dunham WASHINGTON (Reuters) - DNA extracted from the skull of a man buried 4,500 years ago in an Ethiopian cave is providing new clarity on the ancestry of modern Africans as well as shedding light on an influx of people from the ancient Middle East into the Horn of Africa. Until now, genome sequencing efforts on ancient people have focused on remains from cooler, drier climes that tend to better preserve DNA. The cave, sitting 6,440 feet (1,963 meters) above sea level in southwestern Ethiopia's Gamo highlands, was discovered in 2011, University of Cambridge geneticist Andrea Manica said.
By Irene Klotz CAPE CANAVERAL, Fla. (Reuters) - Three years after landing in a giant Martian crater, NASA's Curiosity rover has found what scientists call proof that the basin had repeatedly filled with water, bolstering chances for life on Mars, a study published on Thursday showed. The research offered the most comprehensive picture of how Gale Crater, an ancient, 87-mile (140-km) wide impact basin, formed and left a 3-mile (5-km) mound of sediment standing on the crater floor. Early in its mission, Curiosity discovered the gravel remnants of streams and deposits from a shallow lake.