Seven Earth-sized planets found orbiting an ultracool dwarf star are strong candidates in the search for life outside our solar system.

The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. Credit: NASA/JPL-Caltech

Seven Earth-sized terrestrial planets have been discovered orbiting an ultra-cool dwarf star. They’re the most promising target yet in the search for life outside our solar system. 40 light years away, the planets are—like Earth—terrestrial rocky worlds that could support life under the right atmospheric conditions. “The seven planets are temperate. This means that they could have some liquid water and maybe, by extension, life on the surface,” said lead author Michaël Gillon.

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