WASHINGTON — NASA's planet hunter satellite TESS has discovered an Earth-sized world within the habitable range of its star, which could allow the presence of liquid water.
TESS initially misclassified the star, which meant the planets appeared larger and hotter than they actually are. But several amateur astronomers, including high school student Alton Spencer -- who works with members of the TESS team -- identified the error. TOI 700 d is about 20 percent larger than Earth and orbits its star in 37 days. It receives 86 percent of the energy that Earth receives from the Sun.
The planet is tidally locked to TOI 700, meaning that one side always faces the star, in the same way that Earthlings never see the "dark side" of the Moon. Multiple astronomers will observe the planet with other instruments, in order to obtain new data that may match one of NASA's models.Another discovery announced at the meeting was TESS's first finding of an exoplanet orbiting 2 stars instead of one, also known as a circumbinary planet.
Named TOI 1338 b, it is the only planet in the TOI 1338 system, which lies 1,300 light-years away in the constellation Pictor, and orbits its stars every 95 days.
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