NASA said that its planet hunter satellite TESS discovered an Earth-sized planet within the habitable range of its star, which could allow the presence of liquid water. Named “TOI 700 d”, the planet is relatively close to Earth — only 100 light years away. Star TOI 700 is small, about 40 percent of our Sun’s size and only about half as hot.
TESS discovered three planets in orbit, named TOI 700 b, c and d. Only “d” is in the so-called habitable zone, where the temperature could allow the presence of liquid water. It is about 20 percent larger than Earth and orbits its star in 37 days. “d” receives 86 percent of the energy that Earth receives from the Sun.