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Sun and TRAPPIST-1 dwarf star, illustration

Sun and TRAPPIST-1 dwarf star, illustration

C034/4985

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Credit

EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY

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This image may not be used by or to promote the arms, nuclear power or tobacco industries or any religious organisation, or in any discriminatory way, or to imply the endorsement by ESO of any product, service or activity.

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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Model release not required. Property release not required.

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