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Racer Isak (rodas)
Race Number 122
Date Fri, 7 Sep 2018 06:46:24 +0000
Speed 52 WPM Try to beat?
Accuracy 93.9%
Rank 1st place (out of 5)
Opponents killua975 (2nd place)

Text typed:

If an exoplanet happens to transit its star, we can often determine both its mass and its radius, and hence estimate its density and possibly even its composition. More than 200 transiting hot Jupiters have been measured in this way. But when astronomers calculate their densities the numbers they obtain are generally much lower than predicted by theory.
Astronomy: A Beginner's Guide to the Universe (7th Edition) (book) by Eric Chaisson, Steve McMillan (see stats)

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