EUROPEAN SOUTHERN OBSERVATORY / O. FURTAK / SCIENCE PHOTO LIBRARY EUROPEAN SOUTHERN OBSERVATORY / O. FURTAK / SCIENCE PHOTO LIBRARY
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TRAPPIST-1 and Solar System size comparisons. Illustration comparing the sizes of objects in the TRAPPIST-1 system and Earth's Solar System. The ultra-cool dwarf star TRAPPIST-1 (orange, diameter of 162,793 kilometres) is about the size of the Solar System's largest planet Jupiter (upper left, diameter of 139,822 kilometres). The Sun (partially shown at bottom right) has a diameter of 1.39 million kilometres. The inset boxes down left show the Galilean moons of Jupiter (Io, Europa, Ganymede and Callisto), the seven planets in the TRAPPIST-1 system (b-h), and the four planets of the inner Solar System (Mercury, Venus, Earth and Mars), all shown to scale. TRAPPIST-1 is 39 light years from Earth, in the constellation of Aquarius. Its planets were discovered in 2015 and 2017. Image published in 2017.
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