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LightSail 2 successfully unfurls its silvery solar sails, prepares to become a truly solar-powered satellite

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They are going to change the shape of the orbit, but they won't be sailing off to the Andromeda Galaxy or anything. The reaction wheel is to change the angle of the sail to the incoming sunlight so that they can make an elliptical orbit. Details are all on their website if you poke around a bit. I must admit the website seems to be more difficult to find stuff on than it used to be.

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