Sun and TRAPPIST-1 dwarf star, illustration

Sun and TRAPPIST-1 dwarf star, illustration

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Caption: Sun and TRAPPIST-1 dwarf star. Illustration comparing the sizes of the Sun (left) and the ultra-cool dwarf star TRAPPIST-1 (right). The Sun has a diameter of 1.39 million kilometres, while TRAPPIST-1 has a diameter of 162,793 kilometres, just over a tenth the size and similar to that of Jupiter. The dwarf star is much redder and cooler than the Sun. The TRAPPIST-1 system has been studied using NASA's Spitzer Space Telescope (SST) and the ground-based TRAPPIST (Transiting Planets and Planetesimals Small Telescope), with seven Earth-sized planets discovered in 2015 and 2017. TRAPPIST-1 is 39 light years from Earth, in the constellation of Aquarius. Image published in 2017.

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Keywords: 2017, 2mass j23062928-0502285, aquarius, artwork, astronomical, astronomy, astrophysical, astrophysics, callisto, comparing, comparison, dwarf star, earth, europa, exoplanet, extrasolar planet, galilean moons, ganymede, habitable zone, illustration, inner, io, jovian, jupiter, label, labeled, labelled, labels, life, liquid water, mars, mercury, no-one, nobody, planet, planetary science, planetary system, planets, rocky, size, sizes, solar system, space, star, stellar system, sun, terrestrial, text, tidally locked, transiting planets and planetesimals small telescope, trappist 1, trappist-1, trappist-1b, trappist-1c, trappist-1d, trappist-1e, trappist-1f, trappist-1g, trappist-1h, ultra-cool dwarf star, universe, venus

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