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re: NASA: new solar system , Trappist-1 ,where life may have evolved on 3 planets

Posted on 2/22/17 at 8:25 pm to
Posted by TheArrogantCorndog
Highland Rd
Member since Sep 2009
14836 posts
Posted on 2/22/17 at 8:25 pm to
quote:

How do they know there are planets there? They can't see them can they? Are they not too far away?



They can see the star, and as the planets pass, the star dims just a tiny bit... they measure that process and frequency, and calculate the results
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