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K2-18 B: Exoplanet Detected With Methane And Carbon Dioxide In Atmosphere By James Webb Telescope

K2-18 B: Exoplanet Detected With Methane And Carbon Dioxide In Atmosphere By James Webb Telescope

NASA says the James Webb telescope has detected methane and carbon dioxide in the atmosphere of a nearby exoplanet

In a space dominated by big news, NASA’s James Webb Space Telescope has gifted us with yet another gem: the discovery of methane and carbon dioxide in the atmosphere of exoplanet K2-18 b. While the universe is vast and mysterious, it’s finds like these that make our quest for knowledge all the more thrilling.

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Quick Dive: What’s the Buzz?

K2-18 b, an exoplanet that’s 8.6 times Earth’s mass, has revealed signs of two significant gases:

  1. Methane
  2. Carbon Dioxide

Fact-check: This isn’t Webb’s first rodeo! Last year, it detected carbon dioxide in another exoplanet. But here’s the clincher – the presence of both methane and carbon dioxide and a conspicuous absence of ammonia on K2-18 b hints at a potentially water-rich atmosphere.

Behind the Scenes: Understanding K2-18 b

Situated 120 light-years away in the Leo constellation, K2-18 b orbits its cool dwarf star. Classified as a potential ‘Hycean’ exoplanet, it could showcase:

  • A hydrogen-rich atmosphere
  • An ocean-laden surface

“Expanding our understanding of habitable environments is crucial for the search for life outside our planet,” asserts Nikku Madhusudhan from the University of Cambridge.

snow covered mountain under blue sky during daytime
K2-18 B: Exoplanet Detected With Methane And Carbon Dioxide In Atmosphere By James Webb Telescope

Why Should You Care?

You see, in our quest for extraterrestrial life, we’ve been fixated on rocky planets akin to Earth. But the Hycean worlds, such as K2-18 b, are shifting this perspective. These celestial bodies, larger than Earth but tinier than Neptune, with potential oceans beneath a hydrogen-rich atmosphere, could be the next big thing in space exploration.

Did You Know?

One of the highlights of this discovery is a potential hint of dimethyl sulfide (DMS) in K2-18 b’s atmosphere. Why’s that intriguing? Because on our home planet, DMS is produced by life, predominantly marine phytoplankton.

Comparing Notes: K2-18 b vs. Earth

FeatureEarthK2-18 b
Size1 Earth8.6 Earths
Major Atmospheric GasesNitrogen & OxygenMethane & Carbon Dioxide
Distance from Its Star1 AUUnknown

To Infinity and Beyond!

The James Webb Space Telescope has thrown us an enticing breadcrumb. And while this discovery is exhilarating, it’s just the tip of the iceberg. The universe is teeming with secrets, waiting to be unraveled.

Are we on the brink of finding life beyond our home? Only time (and more space explorations) will tell.

Stay updated with more news on space explorations here on


  1. Science Daily’s Article on K2-18 b
  2. Webb’s previous CO2 detection
  3. Scientific American’s take on Webb’s findings
  4. SciTechDaily’s article on Webb’s CO2 detection
  5.’s report on Webb’s new discovery
  6. NASA’s official update on Webb’s discoveries

Content based on materials provided by NASA/Goddard Space Flight Center.

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