Transiting Exoplanet Survey Satellite (TESS) of NASA find out a star, called as TESS Object of Interest 270, or TOI 270, which is 73 light-years far away from the Earth that has three exoplanets orbiting it, including super-Earth and other two defined as Neptune-like. “The system is very much similar to what TESS created to find out — small, temperate planets that transfer, in front of an inactive host star. As per study, TOI 270 b, is closer to star and slightly bigger than Earth. NASA described it as an “oven-hot world”, TOI 270 b orbits the star every 3.4 days, around 25% bigger than Earth, and it is estimated to have a mass around 1.9 times more than Earth’s.
Similarly, other two planets – TOI 270 c and TOI 270 d, are described as “mini-Neptunes, a type of planet which is not seen in our own solar system.” These planets are 2.4 and 2.1 times bigger as compare to Earth and orbit TOI 270 every 5.7 and 11.4 days, respectively. TOI 270 is perfectly positioned in the sky for examining the atmospheres of its outer planets along with the NASA’s future James Webb Space Telescope. It will be visible for over half a year by Webb, which allows the corresponding comparisons between atmospheres of TOI 270 c and d.
In April 2018, TESS launched that replaced the Kepler telescope, which was unable to function as per the expectation towards the latter part of last year and was retired in October 2018 after finding more than 2,600 exoplanets, including 18 Earth-sized exoplanets. In September 2018, the US$ 200 million TESS discovered its first exoplanet and in the same year April, it found its first Earth-sized planet.TOI-270 will allow researchers to study this “missing link” between rocky Earth-like planets and gas-dominant Mini-Neptune, because all the planets are made in the same system. The satellite is the replacement to Kepler spacecraft of NASA, which adopt a similar method in order to conduct a census of exoplanets in a small, distant patch of the Milky Way.