Astronomy
Life Beyond Earth
An ocean on Mars. An Earth-like planet light years away. The evidence is mounting, but are astronomers ready to say we're not alone?
Return of the Sun Cult
In Peru, scientists discover the oldest solar observatory in the Americas
Time for a Change
One professor's mission to revise the calendar
The Planet Hunters
Astronomers have found about 200 planets orbiting other stars, and they say it's only a matter of time before they discover another Earth
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