Jupiter's Great Red Spot Is Acting Very Strangely, Puzzling Scientists

Jupiter's Giant Red Spot (GRS) is large enough to swallow the entire Earth — and as new imagery from Hubble suggests, it's a lot weirder than previously thought.

Between December 2023 and March 2024, the Hubble Space Telescope took a closer look at the massive and mysterious "anticyclone" that has long fascinated astronomers and found that not only does its size keep changing, but that it appears to be, well, jiggling.

"While we knew its motion varies slightly in its longitude, we didn’t expect to see the size oscillate," explained NASA's Amy Simon, a director at the agency's Goddard Space Flight Center, in a statement. "As far as we know, it’s not been identified before."

This ginormous storm is, as NASA points out, the largest in our Solar System. In 1979, the Voyager spacecraft clocked its diameter at a whopping 14,500 miles across — but per more recent Hubble observations, it's shrunken to a mere 10,250 miles.

With these latest Hubble images taken over 90 days, the GRS seems to be behaving like a stress ball. The white clouds around it even sort of resemble a squeezing hand — an incredible coincidence that drives home how fascinating this finding really is.