Jan 07

It turns out, like us, stars slow down in their old age. That observation is the key to a new method astronomers are using to accurately tell the age of cool stars — stars that match the size of, or…

NASA's Solar Dynamics Observatory has released dramatic video of a "mid-level" solar flare from April 2. [youtube:http://youtu.be/_8yPQEE2Dnk] Flares are short, powerful bursts of radiation emitted from the sun's surface. NASA says the radiation cannot penetrate the Earth's atmosphere, but on rare…

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