An artist's rendition of a sunset on a planet of the TRAPPIST solar system. Nearly two years ago NASA discovered the TRAPPIST-1 system (40 light-years away), containing seven Earth-sized planets revolving around a red dwarf star. Three of the planets are within the habitable zone around their star. This is an exciting find, and it has NASA scientists giddy with possibilities. Note two planets to the left of the setting star.
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