quick (quickishere)

Race #144

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Official speed 54.20 wpm (78.60 seconds elapsed during race)
Race Start August 29, 2017 3:58:12pm UTC
Race Finish August 29, 2017 3:59:31pm UTC
Outcome No win (4 of 5)
Opponents 3. th100 (63.41 wpm)
Accuracy 93.0%
Points 52.40
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.