How a solar-powered detective is stripping away Jupiter's clouds
In short: For years, Jupiter’s true nature remained hidden behind a veil of storms. Now, NASA's Juno spacecraft is piercing that haze, using a unique polar orbit to reveal a world that defies our textbooks and challenges everything we thought we knew about the solar system's formation.
Named after the Roman goddess who could see through her husband Jupiter's disguises, the Juno spacecraft is performing a scientific feat of unprecedented intimacy. The spacecraft traverses a stretched polar path, descending to just 3,100 miles (5,000 kilometres) above the cloud layer. From this unique angle, it can study the planetary poles and chart magnetic and gravitational patterns that reveal the gas giant's interior. This mission is particularly notable as the first solar-powered spacecraft to operate in such a distant, harsh environment. By mapping the magnetosphere, the probe also investigates how the planet's massive magnetic field influences its atmosphere and creates spectacular aurorae.
The mission's findings have been nothing short of revolutionary. Juno has discovered continent-sized, geometric storms swirling around the poles and revealed that Jupiter's interior is not composed of distinct, lasagna-like layers, but rather looks more like mingling swirls of ink. The probe has also identified active volcanoes and lava lakes on the moon Io, and provided critical data on the thickness of the icy shell encasing Europa, a prime candidate in the search for habitable worlds. Beyond these discoveries, the probe has confirmed that winds on the planet extend hundreds of miles into the interior. It also seeks to determine the exact amount of water present in the atmosphere to refine planet formation theories.
Despite enduring a 1.7 billion-mile (2.8 billion kilometer) journey and surviving intense radiation that should have corroded its electronics, Juno continues to operate. However, the mission is approaching its twilight. The extended mission is scheduled to continue through September 2025, after which the spacecraft may eventually plunge into Jupiter's stormy atmosphere. Even so, its legacy remains: by studying how Jupiter formed, scientists are gaining a clearer window into the very beginnings of our solar system. The spacecraft's journey was aided by a gravity assist from Earth in 2013, which provided a speed boost of over 14,000 km/h. Even during its long transit, the mission carried small aluminium Lego figures of Galileo Galilei and other figures to inspire future scientists.
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Sources
- Summary by Intellect · source: The Science of Juno ‘s Mission to Jupiter
- Also: Juno - NASA Science
- Also: Juno - NASA's mission to Jupiter | Royal Museums Greenwich
- Also: How NASA’s Juno Probe Changed Everything We Know about Jupiter | Scientific American
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