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James Webb Telescope Unveils Rotten Egg Stench on Nearby Exoplanet

Discovery of hydrogen sulfide on HD 189733 b provides new insights into sulfur's role in planetary formation and atmospheric composition.

The exoplanet very closely orbits its host star, which causes the planet to have a scorching surface temperature.
An illustration depicts exoplanet HD 189733b, a gas giant located 64 light-years away.
Image
A firey orange sphere to the left of a partly shadowed blue and white sphere against a very dark background

Overview

  • HD 189733 b, a hot Jupiter exoplanet, has hydrogen sulfide in its atmosphere, causing a rotten egg smell.
  • The planet's extreme weather includes glass rain and 5,000 mph winds, making it highly inhospitable.
  • Researchers aim to understand how sulfur affects the formation and composition of gas giants beyond our solar system.
  • The James Webb Space Telescope's findings challenge previous assumptions about methane in HD 189733 b's atmosphere.
  • Future studies will track sulfur in other exoplanets to explore its influence on their proximity to parent stars.