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Astronomers discover the seven Earth-size TRAPPIST-1 planets may be made of similar stuff

Explainer Channel
Explainer Channel
A new international study has measured the densities of the seven Earth-size planets around TRAPPIST-1 with extreme precision.According to a press release from the University of Liege, scientists now know more about the densities of these planets than of any other planets outside our solar system, and this provides an important clue as to their compositions.The study was published on Jan. 22 in the Planetary Science Journal.

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