Our sun is apparently a happy star according to the latest video from a NASA observatory. The video shows a pattern of sunspots that, when viewed from afar, forms a vast happy face smiling across face of the sun.
Sunspots are darker, cooler patches on the sun caused when intense magnetic activity blocks heat convection. These spots are normal, but they don't usually align to give the sun's face such character.
The smile on the sun is visible through 11 photographs taken by NASA's Solar Dynamics Observatory, which images the sun from Earth orbit. Each picture was taken at the same time, but through a different filter that separated out a narrow wavelength band of light. The images range from lowest temperature to highest. [Video of Smiley Face on Sun]
These different temperatures correspond to different layers of the sun's atmosphere, starting with the sun's surface and gradually moving out to the sun's upper corona.
Magnetic activity on the sun generally follows an 11-year cycle of waxing and waning. At the moment solar activity is coming out of a lull and starting to heat up, moving toward an expected peak around 2013.
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Clara Moskowitz is a science and space writer who joined the Space.com team in 2008 and served as Assistant Managing Editor from 2011 to 2013. Clara has a bachelor's degree in astronomy and physics from Wesleyan University, and a graduate certificate in science writing from the University of California, Santa Cruz. She covers everything from astronomy to human spaceflight and once aced a NASTAR suborbital spaceflight training program for space missions. Clara is currently Associate Editor of Scientific American. To see her latest project is, follow Clara on Twitter.