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Cloudy vs. Clear Atmospheres on Two Exoplanets

Cloudy vs. Clear Atmospheres on Two Exoplanets
This illustration compares the atmospheres of two "hot Jupiter"-class planets orbiting very closely to different sunlike stars. The planets are too far away for the Hubble Space Telescope to resolve any details. Instead, astronomers measured how the light from the parent stars is filtered through each planet's atmosphere. Hubble was used to measure the spectral fingerprint caused by the presence of water vapor in the atmosphere. HAT-P-38 b did have a water signature, indicating the upper atmosphere is free of clouds or hazes. By contrast, a very similar hot Jupiter, WASP-67 b, showed no water vapor, suggesting that most of the planet's atmosphere is masked by high-altitude clouds.

About the Data

  • Instrument
    InstrumentThe science instrument used to produce the data.
    HST>WFC3/IR
  • Object Name
    Object NameA name or catalog number that astronomers use to identify an astronomical object.
    HAT-P-38 b WASP-67 b
  • Object Description
    Object DescriptionThe type of astronomical object.
    Extrasolar planet
  • Release Date
    June 5, 2017
  • Science Release
    Hubble’s Tale of Two Exoplanets: Nature vs. Nurture
  • Credit
    Illustration: NASA, ESA, and Z. Levy (STScI)

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Details

Last Updated
Mar 28, 2025
Contact
Media

Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov