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How to find the possible compositions and structures of trappist-1 planets?

How to find the possible compositions and structures of trappist-1 planets?

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The possible compositions of TRAPPIST-1 planets can be found with the help of the density of the planet. And the density can be calculated by observing the dimming of the planet's reflected light when they are lined up. To calculate the density, scientists take the help of "transit timing variations". Also, by observing the gravitational fields on these planets, scientists may predict about its structure. It includes the Time period of that planet around the nearest star.

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