The Hubble telescope has uncovered new surprises hidden in Jupiter’s Great Red Spot (GRS). NASA scientists observing the feature found that it is not stable as it is growing and shrinking in size.
“While we knew its motion varies slightly in its longitude, we didn’t expect to see the size oscillate. As far as we know, it’s not been identified before,” Amy Simon of NASA’s Goddard Space Flight Center said in a statement.
The results of the study has been published in the Planetary Science journal.
Hubble has helped confirm that the GRS is squeezing in and out at the same time as it moves faster and slower. “That was very unexpected, and at present there are no hydrodynamic explanations,” Simon said.
According to NASA, the Great Red Spot is actually a storm on Jupiter that is swirling for at least the last 150 years. Measuring about 16,350 km wide, it extends 100 kilometres beneath the cloud tops and is nearly 1.3 times the width of the Earth.
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Scientists say that studying largest storms in the solar system puts the theory of hurricanes on Earth into a broader cosmic context. This could help better understand the meteorology on planets around other stars.
Simon said that the observation team noticed a lot of changes everyday while studying the size, shape and color changes of the GRS. Scientists observed it for 90 days between December 2023 to March 2024.
“As it accelerates and decelerates, the GRS is pushing against the windy jet streams to the north and south of it. It’s similar to a sandwich where the slices of bread are forced to bulge out when there’s too much filling in the middle,” said co-investigator Mike Wong of the University of California at Berkeley.
Scientists have concluded that the GRS will continue shrinking as a result of the stormy process before taking on a stable, less-elongated, shape.
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(Image: NASA)