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NASA last month selected the landing sites for rovers scheduled to begin exploring the Martian surface next January.
Tracking the precise motion of a spacecraft orbiting Mars, planetary scientists have deduced that the core of the Red Planet is at least partially liquid.
Melting snow may have sculpted the recently formed gullies found at midlatitudes on Mars.
Mercury: The solar system's inner frontier.
Astronomers say they have discovered three additional moons circling Neptune.
In some of the coldest regions on Mars, water appears to have recently gushed from just beneath the surface, running down crater walls and steep valleys.
Planetary scientists have discovered ice near the edge of Mars' south polar cap.
Scientists analyzing images of the moon's surface taken from lunar orbit believe they've identified the crater that formed when a small asteroid slammed into the moon almost 5 decades ago.
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