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MatthewB comments on Max Tegmark on our place in history: "We're Not Insignificant After All" - Less Wrong
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The Kepler Observatory also detects planets by masking the light from the star and then looking for any bright spots (Coronal Masking).
Even more advanced telescopes will use this technique in combination with the gravity wobble. There are also diffraction and coronal masking.
http://www.iop.org/EJ/article/0004-637X/662/1/738/65461.web.pdf
http://spie.org/x24241.xml?ArticleID=x24241
why did I get down voted on that post?