trappist.one - TRAPPIST-1

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Description: Official webpage for the TRAPPIST-1 system

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Presenting humanity with many opportunities to study terrestrial worlds beyond our Solar system.

TRAPPIST-1 is a planetary system, located 12 parsecs away from the Solar system (39 light years), near the ecliptic, within the constellation of Aquarius. Around a star which is 12 times less massive than the Sun and only slightly larger than Jupiter, there are at least seven planets in orbit. The initial discovery was made by TRAPPIST , the TRAnsiting Planets and PlanetesImals Small Telescope. Additional planets were subsequently identified using TRAPPIST and the Spitzer space telescope , the Very Large Te

All the planets in the TRAPPIST-1 system transit their star, meaning that they pass in front of it. The planets were discovered from the regular and repeated shadows that are cast during transit. Thanks to the transit signals we could measure the orbital periods of the planets and could calculate the sizes of the planets. The exact time at which the planets transit also provide us with a means to measure their masses, which leads to knowing their densities and therefore their bulk properties. The planets ar

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