Chandra sees most powerful supernova ever
Posted: Tue, May 8 8:10 AM ET (1210 GMT)
Astronomers using the Chandra X-Ray Observatory have detected what they believe to be the most powerful supernova explosion ever, one that outshone its host...

Spacecraft finds its first exoplanet
Posted: Mon, May 7 8:27 AM ET (1227 GMT)
A French spacecraft launched late last year has discovered its first extrasolar planet, raising hopes that the satellite will be able to discover smaller, Earth-...

Ariane launches two satellites
Posted: Sat, May 5 10:15 AM ET (1415 GMT)
An Ariane 5 launched two commercial communications satellites Friday evening after a one-day delay. The Ariane 5 ECA lifted off from Kourou, French Guiana,...

Mercury has molten core
Posted: Sat, May 5 10:03 AM ET (1403 GMT)
Scientists have determined that the core of innermost planet Mercury is most likely molten, a discovery that may explain why the planet is able to...

Winds delay Ariane launch
Posted: Fri, May 4 8:23 AM ET (1223 GMT)
Gusty high-altitude winds delayed Thursday's scheduled launch of two communications satellites on an Ariane 5. The Ariane 5ECA was scheduled to lift off...

Wally Schirra passes away
Posted: Thu, May 3 8:40 PM ET (0040 GMT)
Walter "Wally" Schirra, a member of the original group of NASA astronauts and the only one to fly on Mercury, Gemini, and Apollo missions, passed...

Train carrying shuttle SRB segments derails
Posted: Thu, May 3 7:42 AM ET (1142 GMT)
A train carry shuttle solid rocket booster (SRB) segments for use on a launch later this year derailed Wednesday, injuring several people. The train, en...

Mars subsurface ice is patchy
Posted: Thu, May 3 7:32 AM ET (1132 GMT)
The depths below the surface where water ice exists near the polar regions of Mars depends strongly on the properties of the surface, scientists reported...

Pluto-bound spacecraft provides close-up look at Jupiter system
Posted: Wed, May 2 8:45 AM ET (1245 GMT)
A Pluto-bound spacecraft that flew past Jupiter in late February has provided scientists with their first close-up look at an emerging storm in...

Orbital wins contract for Intelsat spacecraft
Posted: Wed, May 2 8:39 AM ET (1239 GMT)
Orbital Sciences Corporation announced Tuesday that it has won a contract from Intelsat to build a new communications satellite. The IS-15 spacecraft is based...