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typeracer

Pit Stop
Racer Thelonious (thelonious)
Race Number 13457
Date Sun, 26 Mar 2017 21:36:24
Speed 68 WPM Try to beat?
Accuracy 93.2%
Rank 1st place (out of 5)
Opponents uselesscrouton (3rd 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)