NASA and L'Garde are set to launch the largest solar sail ever constructed in 2014. ->
Electricity from coal is downright expensive compared to power from a new solar plant. ->
Super villains aside, some have proposed blocking out the sun to curb global warming. But the U.N. may say no.
From buying a Christmas tree to lighting it, saving energy is not difficult.
The cooling effect of the moon's shadow can cause atmospheric waves that travel about 100 meters (328 feet) per second.
The A-train of satellites monitoring Earth's equator is picking up a caboose.
A prototype solar reactor turns sunlight into storage-ready methane or hydrogen.
Researchers found a new way to create super thin solar cells without the waste.
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