Astronomers have spotted a large and mysterious dark spot within Neptune's atmosphere, and it has an unexpectedly bright companion.
Space-based observatories such as the Hubble Space Telescope have observed vortex-like storms — which appear as dark spots — swirling in the blue planet's atmosphere before, but it's the first time an Earth-based telescope has seen one on Neptune.
Neptune's storms behave differently than hurricanes on Earth. The dark spots are high-pressure systems that start out stable and rotate clockwise, while hurricanes in Earth's Northern Hemisphere are low-pressure systems that rotate counter-clockwise. Earth's atmosphere tends to create a distorting effect for ground-based telescopes, but MUSE relies on a technique called adaptive optics to capture sharp images. The telescope's mirrors, controlled by computers, can make real-time adjustments that correct any distortions caused by Earth's atmosphere and preserve the fine details of celestial objects.
France Dernières Nouvelles, France Actualités
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