Marco (studiouscloud)

Race #671

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Official speed 52.35 wpm (81.38 seconds elapsed during race)
Race Start November 26, 2020 4:36:03pm UTC
Race Finish November 26, 2020 4:37:24pm UTC
Outcome No win (2 of 5)
Accuracy 95.0%
Points 50.61
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.