Scientists discover Earth-sized exoplanet bearing life-supporting signs.
                     Scientists 
discover Earth-
sized exoplanet 
bearing life-
supporting signs
Introduction
• Sometimes astronomical phenomena 
and events relating to space become so 
amazing that the more we get into them, 
the more intriguing it becomes. 
• A new study by a group of scientists has 
surfaced that reveals the discovery of a 
new planet that may be habitable along 
with various pieces of evidence essential 
to life.
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Source: indianexpress.com
Transiting Exoplanet 
Survey Satellite 
(TESS)
• The Transiting Exoplanet Survey Satellite 
(TESS) discovered 11 new stars close to 
the Sun while being the size of an M-
dwarf star. 
• In addition, these stars have a mass less 
than 60% of the mass of the Sun while 
having a temperature below 3,900 
Kelvin. 
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Source: 
newstube.co.in
AIM OF THE STUDY
• As for TESS, it was launched in 2018 to 
discover new stars and subsequent 
planets orbiting them near the Sun. 
• In addition to this, the aim of this study 
is also to study the nature of these 
planets as well as the type of 
atmosphere that prevails there.
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Source: 
newstube.co.in
DISCOVERY
• According to the study published in 
Astrobiology, 17 such planets were 
recently discovered orbiting their 
respective stars. 
• A team of scientists focused on three 
small planets found orbiting a small M-
dwarf star.
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Source: universetoday.com
TOI-700d
• In this series, the star named “ TOI-700d 
” was found to represent the size of the 
Earth while being located in the 
habitable zone of the star. 
• In addition, this TOI-700d star is 102 light 
years from Earth.
Source: 6
newstube.co.in
RADIOUS
• The radius of the other two planets, 
including the Earth-sized planet, is 1.04, 
2.65, and 1.14 respectively, while their 
orbital periods span 9.98. , 16.05 and 
37.42 days respectively.
Source: 7
newstube.co.in
M-dwarf star
• TOI-700d is also becoming an attractive 
planet on which astronomers can 
continue their research as it revolves 
around a M-dwarf star that is much 
cooler than the Sun while the planet 
itself is located in absolute proximity to 
the star.
Source: NASA 8
accommodate the 
possibility of life
• It could allow surface water to be liquid 
with an atmosphere that can pose crucial 
signs of life. 
• So, unlike Mercury which is also located 
closest to the Sun and whose climate 
and temperature are untenable, this 
Earth-sized planet is even closer to its 
star than Mercury could still 
accommodate the possibility of life.
Source: NASA 9
infra-red digicam
• astronomers at TESS have used IRAC 
delicate infra-red digicam from Spitzer 
Area Observatory to detect and 
additional substantiate their findings via 
sure indicators.
Source: NASA 10
water-bearing 
clouds
• Within the hindsight, astronomers have 
already noticed the planet twice in 
October 2019 and January 2020. 
• TOI-700d may need rocky floor with its 
mass ranging at that of two i.e Earth-
masses. Moreover scientists are hopeful 
of discovering water-bearing clouds 
within the environment of the planet.
Source: 11
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