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Sunday, February 3, 2008

Firing Up the Sun The sun, in ultraviolet light. The colors reveal temperature, from 1.8 million (blue) to 3.6 million (red) degrees Fahrenheit. Sun scientists have announced the start of a new solar cycle. (It's "Solar Cycle 24," if you're keeping track.) You might not know it, but solar activity... Sign in to see full entry.

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