David (bigd4316)

Race #34442

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Official speed 86.20 wpm (49.42 seconds elapsed during race)
Race Start March 18, 2018 5:07:55am UTC
Race Finish March 18, 2018 5:08:44am UTC
Outcome Win (1 of 5)
Accuracy 97.0%
Points 83.33
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.