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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 PrimeTime Money
Posted on 2/22/17 at 8:25 pm to PrimeTime Money
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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