Who among the following discovered an Earth-sized planet, HD 21749b using Transiting Exoplanet Survey Satellite in 2019?

Correct option is A

The correct answer is (a) NASA.
· In 2019, NASA discovered an Earth-sized planet named HD 21749b using the Transiting Exoplanet Survey Satellite (TESS).
· HD 21749b is an exoplanet located in the constellation Reticulum, and it orbits a star about 53 light-years away from Earth.
· The planet is about three times the size of Earth and has a surface temperature of approximately 150°F (65°C), making it relatively cooler compared to other exoplanets discovered by TESS.
· The TESS mission focuses on identifying planets outside our solar system (exoplanets) by observing small dips in the brightness of stars, which indicate the presence of planets passing in front of them (transiting).