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typeracer

Pit Stop
Racer ragon (ragon206)
Race Number 48
Date Wed, 10 May 2017 17:05:35
Speed 56 WPM Try to beat?
Accuracy 88.8%
Rank 5th place (out of 5)
Opponents benb305 (4th place) salmonofdoubt (1st place)

Text typed:

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.
— (book) by Eric Chaisson, Steve McMillan (see stats)