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Pit Stop

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Racer (khronic)
Race Number 22510
Date Tue, 24 Jan 2017 06:42:06 +0000
Speed 91 WPM Try to beat?
Accuracy 92.0%
Rank 5th place (out of 5)
Opponents jesseyay (4th place) pixis (2nd place) rayng94 (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.
Astronomy: A Beginner's Guide to the Universe (7th Edition) (book) by Eric Chaisson, Steve McMillan (see stats)