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Race #50762

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Official speed 115.86 wpm (36.77 seconds elapsed during race)
Race Start December 31, 2018 11:07:26pm UTC
Race Finish December 31, 2018 11:08:02pm UTC
Outcome Win (1 of 3)
Accuracy 99.0%
Points 111.99
Text #3622418 (Length: 355 characters)

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.