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Giant Solar Flare Leaps From Sun
Eruption from sun's surface is 20 times as long as Earth is wide.
Final Frontier: Images From Far Reaches of the Universe
Why go to Mars when pieces of it have been found on Earth? This meteorite, designated NWA 7034, crashed in the Sahara Desert in 2011. An examination of the rock determined it is 2.1 billion years old and is surprisingly rich in water. Tiny air bubbles in the rock have the same composition as air measured by NASA Mars probes. (Carl Agee/University of New Mexico/AP Photo)
