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Racer Liam (liam236)
Race Number 1157
Date Thu, 2 Aug 2018 21:01:30 +0000
Speed 83 WPM Try to beat?
Accuracy 98.9%
Rank 2nd place (out of 5)
Opponents gerk (5th place) keyboard_crusher (3rd place) matthewb83 (4th 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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