Halfeti, in southeastern Turkey, was one of several towns and villages to be intentionally flooded when the Birecik Dam was built in 2000. But residents still live in the half-submerged town — while ...

Lightning might not strike twice, but black holes apparently do. An international group of researchers led by Tel Aviv ...

An international team of physicists discovered the largest-ever merger of 2 black holes through a phenomenon known as gravitational waves.