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Stereo
4 of 15 from Space probes: Pushing the envelope (images)
The Stereo space observatory -- there are actually a couple of them out there -- has delighted astrophysicists since 2006 with images like these of the sun's solar activity. Stereo, an acronym for Solar Terrestrial Relations Observatory, is a mission to study the Sun and related coronal mass ejections.
March 1, 2012 5:46 AM PST
Photo by: NASA
| Caption by: Charles Cooper
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