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Put stars like the Sun, Proxima Centauri or Sirius into space, add planets with the real masses and sizes of Earth, Mars or Jupiter, and watch them orbit under real gravity. See each planet's year, temperature and whether it sits in the habitable zone, test the system thousands of years ahead, and share it: the link is the system. Start from real systems too: the Solar System, Kepler-16 with its two suns, the seven planets of TRAPPIST-1 and Alpha Centauri.