A rare cloud phenomenon has been spotted and photographed by eagle-eyed reader Adrian Webster. He spotted these noctilucent ...

Beginning in the 1960s, satellite instruments have measured Earth's reflected broadband shortwave radiation and emitted ...

The explosion of a star, called a supernova, is an immensely violent event. It usually involves a star more than eight times ...

A major new study led by NASA has revealed something alarming: Earth’s cloud cover is shrinking, and this is making the ...