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typeracer

Pit Stop
Racer Tona (tonaxd)
Race Number 13
Date Sat, 4 Mar 2017 13:19:46
Speed 53 WPM Try to beat?
Accuracy 91%
Rank 2nd place (out of 5)
Opponents giantbox (3rd place) zackgan (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)