By 1973, astronomers had learned enough about these mysterious outbursts to publish the results. What became known as gamma-ray bursts (GRBs) are the most energetic and explosive events in the ...

A ‘superflare’ 10 trillion times brighter than the Sun is confirmed as the record-holder for both luminosity and distance.

In the 1960s, the United States, the United Kingdom, and the Soviet Union signed a treaty banning nuclear weapons tests inside Earth’s atmosphere. Shortly thereafter, the U.S. Air Force launched the ...