Edward (edward54321)

Race #5060

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Official speed 71.85 wpm (59.29 seconds elapsed during race)
Race Start February 22, 2018 12:00:53am UTC
Race Finish February 22, 2018 12:01:53am UTC
Outcome Win (1 of 4)
Accuracy 98.0%
Points 69.45
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.