422
Astronomers have discovered a pair of exoplanets that orbit a red dwarf. According to a study published in The Astrophysical Journal Letters, one of the planets is the coldest planet orbiting an M-class star discovered so far by the TESS space observatory.
Both planets orbit the star TOI 904, which is 150 light-years away from Earth, and both are sub-Neptunes, with radii more than twice as large as Earth’s but smaller than Neptune’s. The outer planet TOI 904c orbits its star in 84 days and has an estimated equilibrium temperature of 217 Kelvin, or -56 degrees Celsius.
