Less activity in a deep atmospheric layer might be what sets Uranus apart.
on the usually quiescent world. Astronomers were astonished given that sunlight was strongest on the planet in 2007, when the sun's light fell directly upon the equator. The reasons for that time gap are poorly understood.For the new study, astronomers used multiple observatories: fresh work from the Gemini North telescope near the summit of Mauna Kea in Hawai'i, along with archival data from the Hawai'i-based NASA Infrared Telescope Facility and Hubble.
One particularly important component of that data was spectra, the distinctive"fingerprints" that measure how much of what wavelengths of light a given object emits. Gemini North's spectra allowed the scientists to understand how reflective each atmosphere was across the entire planet among different wavelengths of near-infrared light.
The resulting model focuses on aerosols, or suspended particles in the atmosphere, suggesting three layers of aerosols at different heights in the two planets' atmospheres.It's the middle layer of each planet that seems to be most responsible for the different hues, the researchers say. In this layer on both planets, methane ice condenses on aerosols, but then the two worlds diverge.
Neptune's more active atmosphere likely produces snow as it moves methane particles into the haze, which removes haze over time. Uranus, however, has a thicker layer of haze due to its slower-moving atmosphere. The scientists also suspect that the middle atmosphere layer is what produces dark spots on each planet.
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