The Martian Atmosphere
A space probe orbiting Mars is sending back evidence of what happened to its once-thick atmosphere.
Space Exploration
Pluto’s Secrets Revealed
Pluto’s first close-ups reveal unexpected geological features.
Comet Chemistry
Comet 67P offers a window into the early solar system, and harbors organic compounds that may have …
Hubble’s 25th Birthday
The Hubble Space Telescope has expanded our knowledge of the universe by leaps and bounds in just 25 …
MESSENGER’s last messages
Before crashing into Mercury’s surface, the MESSENGER spacecraft will capture high-resolution images …
The Jupiter Effect
The planet Jupiter may be responsible for Earth’s mild climate.
Waving to Aliens
Is it time to actively signal civilizations that might exist beyond earth?
Naming Mercury’s Craters
Planetary geologists provide the public with a chance to name five craters on Mercury.