<p>This artist’s impression video compares the seven planets orbiting the ultra-cool red dwarf star TRAPPIST-1 at the same scale. New observations, when combined with very sophisticated analysis, have now yielded good estimates of the densities of all seven of the Earth-sized planets and suggest that they are rich in volatile materials, probably water.
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They are shown to the same scale but not in the correct relative positions.
ESO/M. Kornmesser
CC BY 4.0
<a rel="nofollow" class="external text" href="http://www.eso.org/public/videos/eso1805b/">Planet Parade: the seven planets of TRAPPIST-1</a>