Reaction wheel failures leave Swift rescue mission spinning in orbit

“Preliminary investigation shows that two of Link’s three reaction wheels currently are not operable.” Nearly a month since its launch, a first-of-its-kind commercial satellite built to save NASA’s Swift gamma-ray telescope from a fiery reentry is having problems of its own, the agency announced Tuesday. The Link satellite developed…

Study: Dinosaurs were charbroiled after Chicxulub impact

“We’re in the realm where we might be essentially killing off everything within that first hour or two.” Some 66 million years ago, an asteroid impact wiped out three-quarters of all plant and animal species on Earth, most notably taking down the dinosaurs. But exactly how that impact caused…