50 Years of Robotic Planetary Exploration: Robert Mitchell (Cassini Program Manager at the Jet Propulsion Laboratory)
We asked them and here is what the experts had to say about the last 50 years of planetary robotic exploration.

50 Years of Robotic Planetary Exploration: Amy Simon-Miller (Astrophysicist at the Goddard Space Flight Center)
We asked them and here is what the experts had to say about the last 50 years of planetary robotic exploration.

Comet Lovejoy Plunges into the Sun ... and Survives
Sungrazing Comet Lovejoy has shocked astronomers by surviving its "death plunge" into the sun. Must-see movies of the comet's passage through the sun's atmosphere are featured in today's story from Science@NASA.

"Slam Dunk" Sign of Ancient Water on Mars
As NASA's newest Mars rover Curiosity heads for the Red Planet, veteran rover Opportunity continues to make discoveries. Opportunity's latest find, an apparent vein of the mineral gypsum, is a "slam dunk" sign of past water on Mars, say researchers.

Preparing for Future Human Exploration: Measuring the Radiation Environment on Mars
Southwest Research Institute (SwRI) led the development of the Radiation Assessment Detector, which will measure, for the first time, the radiation environment on the surface of Mars, measuring all the relevant energetic particle species.

New NASA Missions to Investigate How Mars Turned Hostile
Two new NASA missions, one that will roam the surface and another that will orbit the planet and dip briefly into its upper atmosphere, will try to discover what transformed Mars.

Stellar Extremophiles
Back in the 1970s, biologists were amazed to discover a form of life they never expected. Tiny microorganisms with ancient DNA were living in the hot springs of Yellowstone National Park ...

Strange Hollows Discovered on Mercury
NASA's MESSENGER spacecraft has discovered strange hollows on the surface of Mercury.

The Strange Attraction of Gale Crater
It sounds a little odd -- a mountain in the middle of an impact crater.

Orbital Observations of Mercury Reveal Flood Lavas, Hollows, and Unprecedented Surface Details
After only six months in orbit around Mercury, NASA's MESSENGER spacecraft is sending back information that has revolutionized the way scientists think about the innermost planet.