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Racer Isaac (isours33)
Race Number 13
Date Mon, 6 Feb 2017 09:22:45 +0000
Speed 66 WPM Try to beat?
Accuracy 84.4%
Rank 4th place (out of 4)
Opponents aurash (1st place) bahjeng2 (2nd place) nastha (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.
Astronomy: A Beginner's Guide to the Universe (7th Edition) (book) by Eric Chaisson, Steve McMillan (see stats)