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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
- InstrumentInstrumentThe science instrument used to produce the data.HST>WFC3/IR
- Object NameObject NameA name or catalog number that astronomers use to identify an astronomical object.HAT-P-38 b WASP-67 b
- Object DescriptionObject DescriptionThe type of astronomical object.Extrasolar planet
- Release DateJune 5, 2017
- Science ReleaseHubble’s Tale of Two Exoplanets: Nature vs. Nurture
- Credit
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Cloudy vs. Clear Atmospheres on Exoplanets WASP-67 b and HAT-P-38 b
This diagram compares Hubble Space Telescope observations of two "hot Jupiter"-class planets orbiting very closely to different sunlike stars. Astronomers measured how light from each parent star is filtered through each planet's atmosphere. Hubble near-infrared observations...
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Last Updated
Mar 28, 2025
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Media
Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov