NASA outlines ingenious plan to resurrect the Kepler planet hunter "As photons are absorbed and emitted, they generate a small force on the object doing the absorbing (it's the same force that causes some asteroids to spin). Kepler is powered by solar panels that are arranged symmetrically across the probe's long axis. If the probe can be oriented so that the sunlight strikes these panels evenly, the photons will exert a constant and symmetric force against the probe. Kepler's two remaining reaction wheels can then push against that force and keep the telescope gazing steadily at one point in the sky, just as it was designed to do."
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