Finding does not bode well for possibility that microbes capable of producing the gas could be living below surface.

NASA's Mars rover drilled its first bit of powder from inside a potentially water-formed ancient rock.

A meteor streaked across the sky and exploded over Russia's Ural Mountains with the power of an atomic bomb, its sonic blasts shattering countless windows and injuring hundreds.

The twin Gravity Recovery and Interior Laboratory spacecraft will make suicidal plunges near the moon's north pole.

* Rare galaxies found 10 billion light years away

* Infrared telescope discovered millions of black holes

* So-called 'hot DOG' galaxies may be a passing phase

By Irene Klotz

CAPE CANAVERAL, Fla., Aug 29 (Reuters) - Scientists on Wednesday unveiled a new species in the cosmic zoo, a super-heated, dust-shrouded object called a "hot DOG," which may represent a missing link in galaxy evolution.

Scientists on Wednesday unveiled a new species in the cosmic zoo, a super-heated, dust-shrouded object called a "hot DOG," which may represent a missing link in galaxy evolution.

A Jupiter-bound spacecraft prepared to fire its engine Thursday for an important maneuver intended to bring it back toward Earth.

* Rare galaxies found 10 billion light years away

* Infrared telescope discovered millions of black holes

* So-called 'hot DOG' galaxies may be a passing phase

By Irene Klotz

CAPE CANAVERAL, Fla., Aug 29 (Reuters) - Scientists on Wednesday unveiled a new species in the cosmic zoo, a super-heated, dust-shrouded object called a "hot DOG," which may represent a missing link in galaxy evolution.