Whenever Neptune reaches its closest point in the sky to Earth, its portrait is taken by the Hubble Space Telescope and other ground-based observatories. Watching the planet from 1994 to 2020, astronomers have made a puzzling discovery. The clouds in Neptune ’s atmosphere appear to be linked to the solar cycle and not the planet’s cycle of seasons.
The global cloud cover seems to come and go in a cycle that apparently syncs up with the Sun’s 11-year cycle, as it shifts from solar maximum to solar minimum or vice versa. This is surprising since Neptune is so far from the Sun and receives about 0.1% of Earth’s sunlight. This discovery is based on three decades of Neptune observations captured by the Hubble Space Telescope, the Keck Observatory in Hawaii, and the Lick Observatory in California
Neptune Clouds Solar Cycle Hubble Space Telescope Astronomers
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