Mystery explosion 1,000 years ago may be a rare, third type of supernova

Pfizer and Moderna vaccines may provide years of protection from COVID-19

50 years ago, cosmonauts Georgi Dobrovolsky, Vladislav Volkov and Viktor Patsayev became the first (and so far only) humans to die in space when their cabin depressurized. Recovery crews found the trio dead in their seats, with blue patches on their faces and blood dripping from their ears and noses

Rare black hole and neutron star collisions sighted twice in 10 days