A NASA mission has spotted an Earth-size exoplanet orbiting a small star about 100 light-years away
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. . The planet, named TOI 700 e, is likely rocky and 95% the size of our world. The celestial body is the fourth planet to be detected orbiting the small, cool M dwarf star TOI 700. All of the exoplanets were found by NASA’s Transiting Exoplanet Survey Satellite, or TESS mission.
Then there’s TOI 700 c, which is 2.5 times bigger than our planet and finishes one orbit around the star every 16 days. These planets are both likely tidally locked, meaning they always show the same side to the star — much like how the same side of the moon always faces Earth. The two exoplanets in the habitable zone of the star, planets d and e, have longer orbits of 37 days and 28 days, respectively, because they’re a little more distant from the star.
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