NASA's TESS (Transiting Exoplanet Survey Satellite) has discovered its first Earth-size planet TOI 700d in the first week of January 2020. #TOI700d is in the star's goldilocks zone or habitable zone that allows the presence of liquid water on the surface.

TESS ने सम्पूर्ण ब्रह्माण्ड को 13 भाग उत्तर में और 13 भाग दक्षिण में, कुल मिलकर 26 भागों में बांटा है| आकाश के इस बड़े हिस्से को सेक्टर कहते हैं। TESS आकाश के एक सेक्टर पर एक बार में 27 दिनों तक लगातार नज़र रखता है |

एक दिन TESS ने Southern constellation dorado में लगभग 101.4 प्रकाशवर्ष दूर एक तारे TOI 700 की खोज की। यह एक M spectral class का Red Dwarf star है |

TOI 700 star is a small, cool M dwarf located just over 100 light-years away in the southern constellation Dorado. It's roughly 40 of the Sun's mass and size and about half of its surface temperature.

There are three planets in TOI 700 star system.
--- TOI 700 b: Nearest to TOI 700 star and completes its orbital period is 10 days.
--- TOI 700 c: It is a gaseous planet that has 2.6 times the size of planet Earth. It took 16 days to revolve around its star.
--- TOI 700 d: It is an Earth-like planet and inside the Goldylock habitable zone of the TOI 700 star system. Its radius is 1.19R, Mass is 1.72 M as compared to Earth. It takes 37.42 Earth days to complete its orbital period.

यह सभी ग्रह अपने तारे TOI 700 से Tidally Locked हैं| नासा के स्पिट्जर स्पेस टेलीस्कोप (Spitzer Space Telescope) ने भी इस स्टार सिस्टम की खोज को सही पाया है।

TOI 700 d is the TESS's first and one of only a few Earth-size planets found in potentially habitable zones. Others include discoveries by Kepler and several planets in the TRAPPIST-1 system.

Space science topics Covered in this video:-
TOI 700 star system,
TOI 700 b planet, its size, mass, and environment
TOI 700 c
TOI 700 d planet, its distance from Earth, atmosphere, mass, etc in Hindi,
NASA’s TESS mission and its discoveries
Exoplanet and universe exploration
habitable planets and habitable zone
What is Tidal Locking
What is the goldilocks zone

TOI 700 d atmospheric conditions are currently unknown. But scientists are trying to make at least 20 models to calculate the size of exoplanet TOI 700d, it’s surface temperature, pressure, type of star it orbits, and the suitable possibility for habitability.

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