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    Saturn-sized exoplanet with Earth-like temperature reveals methane-rich atmosphere

    May 23, 2026, Categories  Astronomy/Space

    Grey planet with host star in background
    Artist’s impression of a gas giant planet orbiting its distant host star. New research, led by astronomers at Penn State and the Jet Propulsion Laboratory, used NASA’s James Webb Space Telescope to analyze the atmosphere of a gas giant planet about the size of Saturn but with Earth-like temperatures and found it to be rich in methane. Credit: NASA/JPL-Caltech. All Rights Reserved.

    A planet that is about the size of Saturn, but with a temperature more like Earth’s, has an atmosphere rich in methane, according to a new study using NASA’s James Webb Space Telescope (JWST).

    Unlike the gas giant planets—Jupiter and Saturn—in Earth’s solar system, which are distant from the sun and therefore extremely cold, and so-called “hot Jupiters”—giant planets beyond the solar system that are s...

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