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Terrestrial Planets

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Detailed measurements of the physical properties of the seven rocky TRAPPIST-1 planets and the four terrestrial planets in our solar system help scientists find similarities and differences between the two planet families.
Artist rendition of the formation of rocky bodies in the solar system; how they form and differentiate and evolve into terrestrial planets.
All seven planets discovered in orbit around the red dwarf star TRAPPIST-1 could easily fit inside the orbit of Mercury, the innermost planet of our solar system. In fact, they would have room to spare.
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