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Extraterrestrial lights | The Planetary Society

June 13, 2025
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Extraterrestrial lights | The Planetary Society
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We’re not the one world with dazzling auroras. Moons, planets, and even comets can have their very own mild reveals, and a few are very completely different from what we’ve got on Earth. Auroras might be massive or small, faint or shiny, sputtering, regular, and just about each shade of the rainbow. These swirls and arcs typically reveal hidden features of different worlds, and typically, they pose mysteries of their very own. 

Most auroras within the Photo voltaic System are powered by the photo voltaic wind: a torrent of charged particles continually unleashed by our Solar. On Earth, the aurora borealis (northern lights) and aurora australis (southern lights) each get triggered when the photo voltaic wind dumps vitality into our magnetic discipline, inflicting ions to rain down over the north and south poles. When this bathe hits our ambiance, it excites gases like oxygen and nitrogen into giving off an ethereal glow. 

However not each aurora works the identical method. Although all auroras are powered by charged particles working into one thing, some don’t depend on the photo voltaic wind. Others don’t depend upon thick atmospheres, and some don’t even want sturdy magnetic fields. 

Take Venus. Scientists have seen faint inexperienced and blue auroras from our neighboring world, but it surely has no world magnetic discipline. As a substitute, Venus has native magnetic fields that type when the photo voltaic wind interacts with ions within the planet’s ambiance. These fields are weak and patchy, however they’re nonetheless in a position to seize different photo voltaic wind particles and make the sky glow. 

Mars takes this one step additional: It has no world magnetic discipline and solely a skinny ambiance, but it surely boasts at the least 4 completely different sorts of auroras. One seems on the sunlit facet of the planet, one other extends like ribbons throughout its skies, and a 3rd is brought on by the photo voltaic wind getting trapped by weak magnetic fields within the Martian crust. The fourth type of aurora, which typically spreads over the whole planet, was noticed by the Perseverance rover in 2024. This marked the primary time an aurora has ever been noticed from the floor of one other world. 

In comparison with Jupiter, although, these spectacles are like candles within the wind. Auroras on Jupiter are essentially the most highly effective within the Photo voltaic System and as much as 1,000 instances brighter than these on Earth. Although they principally shine within the ultraviolet and infrared, somebody standing atop Jupiter’s cloud deck would possibly be capable to spot faint colours in its evening sky. The glows would look pink and probably additionally purple and blue due to the hydrogen within the planet’s ambiance.





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