Pluto’s atmosphere is leaking into space, staining its neighbor red
In short: Pluto is losing methane to the void at a rate of 1.3 kilograms every second. While this atmospheric escape seems like a simple loss, it reveals a complex celestial dance where a mysterious haze layer acts as both a heater and a coolant, fundamentally reshaping the dwarf planet's environment.
For years, scientists were puzzled by why Pluto’s thin atmosphere was so 'leaky.' In 2015, data from the New Horizons spacecraft allowed planetary scientist Will Grundy to calculate that Pluto sheds approximately 1.3 kilograms of methane into space every second. Remarkably, about 2.5% of this escaping methane is intercepted by Pluto's moon, Charon, where it undergoes organic chemistry that stains the moon's poles red. This phenomenon is unique; nowhere else in the solar system is an atmosphere observed leaking onto a neighboring body in this manner.
The mechanism behind this escape was predicted in 2017 by Xi Zhang. She proposed that a layer of haze in Pluto's atmosphere absorbs extreme ultraviolet light from the sun. This absorption provides the energy needed to 'nudge' molecules like methane out of the atmosphere and into space. However, this same haze also creates a cooling effect. It was previously detected in Pluto's mesosphere—the layer between 20 and 40 kilometers high—which reaches a maximum temperature of minus 163 degrees Celsius before cooling to a minimum of minus 203 degrees Celsius.
The James Webb Space Telescope (JWST) recently confirmed the existence of this blue haze, which is produced by Mie scattering—the back-scattering of light off small particles. This discovery validates Zhang's theory that the haze provides the thermal emission at mid-infrared wavelengths first detected by previous observatories like Spitzer and Herschel. By confirming the haze, JWST has bridged the gap between theoretical predictions and the physical reality of Pluto's strange, interactive atmospheric dynamics.
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Sources
- Summary by Intellect · source: Pluto Is Far Stranger Than We Thought (JWST Observations)
- Also: Pluto
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