Taking into consideration its size, an ancient relative of piranhas weighing about 20 pounds delivered a bite with a force more fierce than prehistoric whale-eating sharks, the four-ton ocean-dwelling Dunkleosteus terrelli and – even – Tyrannosaurus rex.

Scientists found treasure when they studied a meteorite that was recovered April 22, 2012 at Sutter's Mill, the gold discovery site that led to the 1849 California Gold Rush.

A new study indicates that clay minerals, rocks that usually form when water is present for long periods of time, cover a larger portion of Mars than previously thought.

Just in time for the holidays, NASA's Cassini spacecraft, in orbit around Saturn for more than eight years now, has delivered another glorious, backlit view of the planet Saturn and its rings.

Working with fossils found in Tanzania, scientists have discovered what may be the oldest known dinosaur.

The NASA/ESA Hubble Space Telescope celebrates the holiday season with a striking image of the planetary nebula NGC 5189.

Thousands of species of microorganisms are making their way from Asia across the Pacific Ocean and landing in North America.

WCS and partners develop method to discern how landscape features affect dispersion of noise and distribution of wildlife.

A hearing system component thought to be unique in toothed whales like dolphins has been discovered in insects, following research involving the University of Strathclyde.

A NASA mission to study the sun will make its third launch for a six-minute flight to gather information about the way material roils through the sun's atmosphere.