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Racer Suwandy (simplykid)
Race Number 41
Date Fri, 24 Feb 2017 12:54:54 +0000
Speed 46 WPM Try to beat?
Accuracy 94.4%
Rank 3rd place (out of 3)
Opponents darkemperor101 (1st place) zsolesz71 (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)