NASA's Goddard Space Flight Center

Solar cycle primer

(PhysOrg.com) -- Telescopes spotted the first blemish on the sun in 1611. While the sun had long been thought—at least in the Western world—to be an unchanging, "perfect" orb, sky-watchers observed black sunspots ...

dateOct 28, 2011 in Space Exploration
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Space weather: Explosions on Venus

In the grand scheme of the solar system, Venus and Earth are almost the same distance from the sun. Yet the planets differ dramatically: Venus is some 100 times hotter than Earth and its days more than 200 times longer. The ...

dateMar 05, 2012 in Space Exploration
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