theIASHub | 24 May, 2025 | 4
K2-18b: Recently, a team of astronomers sparked worldwide excitement by reporting possible signs of life on the distant exoplanet K2-18b, more than 120 light-years away.
o They claimed to have detected dimethyl sulfide—a molecule on Earth associated solely with biological activity—in the planet’s atmosphere.
o They vary widely in size, from gas giants larger than Jupiter to small, rocky planets like Earth.
o Their temperatures range from extremely hot to freezing cold.
o The first confirmed exoplanet discovery was in 1992, though possible evidence appeared as early as 1917.
o Over 5,000 exoplanets have been discovered to date, according to NASA.
o It orbits a star named K2-18.
o Discovered in 2015 by the Kepler Space Telescope.
o Likely to have a hydrogen-rich atmosphere.
o It is approximately 5.2 times wider and 9 times more massive than Earth.
o Receives a similar amount of stellar radiation from its star as Earth does from the Sun, suggesting the potential for habitable surface conditions.
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