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Measuring the Masses and Diameters of the TRAPPIST-1 Planets

Thursday, 28 January, www.spitzer.caltech.edu

Measuring the mass and diameter of a planet reveals its density, which can give scientists clues about its composition. Scientists now know the density of the seven TRAPPIST-1 planets with a higher precision than any other planets in the universe, other than those in our own solar system

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