Astronomers have found the largest known galaxy cluster in the ancient Universe, calling it "El Gordo" - Spanish for "the Fat One".

Crested macaque monkeys look to their friends for guidance more than to their family, according to scientists.

US scientists document potentially dangerous viruses in illegally imported wildlife products that were confiscated at major American airports.

A nuclear scientist is killed after a suspected bomb exploded in a car in northern Tehran, the latest in a string of such nuclear-linked attacks.

The Doomsday Clock, a symbolic gauge of nuclear danger, is moved a minute closer to midnight because of inadequate progress on nuclear and climate issues.

Every star in the Milky Way is host to at least one planet, say astronomers reporting at the American Astronomical Society meeting.