NASA’s unmanned Transiting Exoplanet Survey
Satellite (TESS) space telescope has discovered its Earth-sized exoplanet,
called HD 21749c. Exoplanet is a planet which orbits a star outside the solar
The exoplanet orbits its parent star HD 21749,
which is 52 light years away from Earth. It is located in the constellation of
Reticulum. Earth-sized HD 21749c circles its parent star once every 7.8 days.
TESS has also discovered a warm sub-Neptune-sized
world, called HD 21749b, in the same system. HD 21749b has about 23 times
Earth’s mass and a radius of about 2.7 times Earth’s. It takes about 36 days to
orbit around the parent star.
NASA’s Transiting Exoplanet Survey Satellite is
an all-sky survey mission that seeks to discover exoplanets around nearby
bright stars. It was launched in April 2018, aboard a SpaceX Falcon 9 rocket.