Planets
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PlanetsSo many ‘Earths’
A new analysis suggests humans are not alone in the universe. Our galaxy alone may host billions of Earth-like planets, ones able to support life as we know it.
By Andrew Grant -
PlanetsScratching the Martian surface
What’s Mars made of? Volcanic rock, glassy particles and a poisonous rocket-fuel chemical, among other things. That’s the latest from tests by NASA’s Curiosity rover.
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PlanetsSeeing the moon’s water
Rocky details of our moon can be gleaned without the aid of visiting astronauts. The latest example: An orbiting spacecraft may have just spotted water locked within surface rocks.
By Sid Perkins -
PlanetsOut-of-this-world atmospheres
Light from a distant, giant world offers clues to the gases in its atmosphere.
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PlanetsHome on the moon
Astronomers say rocky moons orbiting distant planets might support alien life.
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PlanetsIce on Mercury
MESSENGER spacecraft provides evidence for frozen water on planet closest to sun.
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PlanetsA diamond planet?
Distant, carbon-rich world could contain one-third its weight in gems that are relatively rare on Earth.
By Sid Perkins -
PlanetsNew planetary neighbor
Nearest star system has a world that's Earthly in size, but too hot for human visitors.
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TechCuriosity lands on Mars!
NASA successfully delivered a $2.5 billion robotic vehicle to Mars, one that will explore for signs that the planet might once have hosted life
By Janet Raloff -
PlanetsWorlds beyond the solar system
Planet hunters have found hundreds of exoplanets, but none just like Earth.