Justin (justin1013)

Race #6520

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Official speed 69.51 wpm (61.29 seconds elapsed during race)
Race Start July 29, 2017 7:16:36pm UTC
Race Finish July 29, 2017 7:17:38pm UTC
Outcome No win (2 of 2)
Accuracy 98.0%
Points 67.20
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.