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    • In Depth - NASA Science

      In Depth - NASA Science

      NASA· 4 hours ago

      An exoplanet, or extrasolar planet, is a planet outside of our solar system that usually orbits another star in our galaxy.

    • Possible Interiors of the TRAPPIST-1 Exoplanets

      NASA· 4 hours ago

      The planet densities are slightly lower than those of Earth or Venus, which could mean they contain fractionally less iron (a highly dense material) or more low-density materials ...