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Astronomers utilizing the James Webb Space Telescope (JWST) have gained unprecedented insights into the distant reaches of our solar system, specifically the dwarf planet Pluto.

The latest JWST data highlights the crucial role that clouds on Pluto play in shaping the planet’s weather, offering valuable details about Earth’s primordial atmosphere.

NASA’s New Horizons spacecraft, during its 2015 flyby of Pluto, revolutionized our understanding of the dwarf planet, revealing vast ice plains and contoured mountains, dispelling the notion of it being merely an inactive ice ball.

One of the most remarkable discoveries was a layer of bluish fog enveloping Pluto’s sky, extending over 185 miles (300 kilometers) above the surface, far exceeding initial expectations.

Now,nearly a decade later,new JWST data provides compelling evidence that this fog is not just an anomaly but a key factor in regulating Pluto’s climate.

“this is a unique thing in the solar system. this is a new type of climate,” said Tanguy Bertrand, an astronomer at Paris Observatory in France.

The findings, published on June 2 in the journal Nature Astronomy, suggest that similar atmospheric dynamics may be at play on other icy worlds in our solar system and could even shed light on the climate of early Earth.

The high-altitude fog on Pluto consists of complex organic molecules formed from methane and nitrogen reactions driven by sunlight. The hypothesis that this haze controls Pluto’s climate was initially proposed in 2017.

Computer models indicate that these particles absorb sunlight during the day and release it as infrared energy at night, making atmospheric cooling far more efficient than gas alone. This phenomenon could explain why Pluto’s upper atmosphere is approximately -333 degrees Fahrenheit (-203 degrees Celsius), substantially colder than anticipated.

However,verifying this theory proved challenging for years,primarily due to the proximity of Pluto’s large moon,Charon,whose thermal signals often interfered wiht telescope data.

“basically, we cannot find out which part of the signal caused by Charon and which parts are caused by Pluto’s fog,” continued Tanguy Bertrand.

The researchers behind the 2017 study predicted that Pluto’s fog would exhibit unique characteristics in the mid-infrared wavelength, a prediction that could only be tested with advanced instruments. The opportunity arose in 2022 when JWST’s powerful infrared capabilities enabled the separation of signals from Pluto and Charon, confirming the presence of faint infrared light.

“In Planet science, it is not common to have a hypothesis that is confirmed so fast, in just a few years. So we feel very lucky and very excited,” said Xi Zhang, a Planet scientist at California University.

This discovery raises the possibility that similar haze-driven climates may exist on other icy bodies, such as Neptune’s moon Triton or Saturn’s moon Titan.

Furthermore, Earth’s past may hold parallels. Before oxygen transformed our planet’s atmosphere, a fog of organic particles might have shrouded the Earth, potentially stabilizing temperatures and fostering the growth of early life.

Xi Zhang added that studying the fog and chemical composition of Pluto could provide new insights into the conditions that made ancient Earth habitable.

“This is a unique thing in the solar system. This is a new type of climate,”