Three decades of supernova observations are adding to hints that dark energy may be changing over cosmic time.

Earth was hit by a huge burst of gamma rays originating from a star nearly 2 billion lightyears away, according to the European Space Agency. The gamma ray burst caused a disturbance in Earth's ...

Earth may owe some of its properties to a nearby star that blew up just as the solar system was forming. This pattern, which saw a supernova bubble envelop the sun and shower it with cosmic rays, may ...