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Space
Space
Science
Keith Cooper

Jupiter's Great Red Spot is being squeezed, Hubble Telescope finds — and nobody knows why (video)

Amy Simon Hubble Jupiter Hubble Space Telescope NASA
A tan, gaseious Jupiter hangs in black space, layered like a cross section of geological survey, a swirling red storm at its lower left.

The venerable Hubble Space Telescope has watched Jupiter's Great Red Spot (GRS) oscillating, as though it were being squeezed in and out roughly every 90 days. 

Why this huge anticyclone, which has been shrinking over the decades and currently measures about 9,165 miles (14,750 kilometers) across (although astrophotographer Damian Peach has reportedly measured it to be just 7,770 miles, or 12,500 km, wide), is behaving in such fashion is a mystery. 

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