NASA Telescope Reveals Seven Earth-sized Planets Around Single Star

UNSPECIFIED: In this NASA digital illustration handout released on February 22, 2017, this artist's concept will appear on the February 23rd, 2017 cover of the journal Nature announcing that the TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. Any of these planets could have liquid water on them. Planets that are farther from the star are more likely to have significant amounts of ice, especially on the side that faces away from the star. The system has been revealed through observations from NASA's Spitzer Space Telescope as well as other ground-based observatories, and the ground-based TRAPPIST telescope for which it was named after. (Photo digital Illustration by NASA/NASA via Getty Images)