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Invasive shrimp species found in Wales

Cardiff, Wales -- British environmentalists say an invasive "killer" shrimp that feeds on native counterparts, young fish and insect larvae has been detected in Wales.

The predatory Dikerogammarus villosus can have serious impacts on the ecology of habitats it invades and can cause extinctions, the BBC reported.

Dubbed the killer shrimp by biologists for its voracious appetite, it often kills its prey and leaves it uneaten.

Originally from the steppe region between the Black Sea and the Caspian Sea, D. villosus, which can grow to be much larger than native freshwater shrimp, has been spreading across Western Europe for 10 years.

Oxygen detected on Saturn moon

Pasadena, Calif. -- NASA's Cassini space probe orbiting Saturn has found evidence of an atmosphere on Rhea, one of the ringed planet's moons, U.S. researchers say.

The spacecraft has detected a very thin atmosphere containing oxygen and carbon dioxide around the icy moon, a NASA release said Friday.

This marks the first instance of a spacecraft directly capturing molecules of an oxygen atmosphere -- admittedly a very thin one -- at a world other than Earth, scientists said.

The formation of oxygen and carbon dioxide, as detected on Rhea, could possibly drive complex chemistry on the surfaces of many icy bodies in the universe, researchers say.

Astronomers witness apparent birth of a black hole

Space telescopes have detected a young black hole formed from a supernova, or an exploding star, 30 years ago, a team of U.S. and European astronomers reported on Monday.

Tennis great Martina Navratilova has breast cancer

Tennis great Martina Navratilova has breast cancer. The former tennis superstar told People magazine that doctors detected the cancer in its early stages.