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Building a Better Guide Star, Times Five

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Wavefront reconstruction of multiple beams improves telescope performance.

Hank Hogan

The nursery rhyme is half correct: Stars are not little, but they do twinkle — thanks to fluctuations in the atmosphere. Consequently, when astronomers peer upward, they get a less-than-perfect image of stars and planets. So they have turned to guide stars and adaptive optics to improve their...Read full article

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