NASA's Messenger probe, the first spacecraft ever to orbit Mercury, has already taken more than 20,000 images.
After a journey of 6 1/2 years, nearly 15 laps around the sun, NASA's Messenger spacecraft will perform its orbital insertion maneuver on Thursday, becoming the first spacecraft to enter Mercury's orbit.
Gliese 581g would be the first Earth-like planet found orbiting in a star's habitable zone. The new plant is located in a region where temperatures could sustain life and liquid water on its surface.
But tomorrow's could be, unless efforts to combat climate change include much more development of carbon-free sources of energy. The findings appear Thursday in the journal Science.
Gulf oil spill is a crude reminder of the many ways humans are fouling the planet. Can Earth survive?
Uncovered in the central part of Antarctica, the two tiny meteorites appear to have come from ancient comets.
Mercury, the oddest of the rocky planets, has been little understood by scientists. But on a swing by the planet, NASA's Messenger sent back intriguing data about Mercury's surface minerals and volcanic activity.