the game (arcane_)

Race #228

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Official speed 85.52 wpm (49.81 seconds elapsed during race)
Race Start November 17, 2018 12:37:07pm UTC
Race Finish November 17, 2018 12:37:57pm UTC
Outcome Win (1 of 4)
Opponents 3. dusitnj (77.50 wpm)
Accuracy 97.0%
Points 82.67
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.