Jupiter’s Great Red Spot suddenly has a sibling – an enormous new spot that some planetary scientists think could be evidence of global climate change sweeping the gaseous planet.
The new spot – dubbed Red Spot Junior – is about half the size of the Great Red Spot. Both are caused by violent storms churning the upper atmosphere of the planet.
Amateur and professional astronomers have been observing the new spot for the past few weeks. The National Aeronautics and Space Administration released pictures Thursday taken by the Hubble Space Telescope, showing both red spots at a level of detail unmatched since Voyager 1 and 2 flew past Jupiter a quarter century ago.
“Planets with atmospheres are dynamic and changing,” said Ray Villard of the Space Telescope Science Institute in Baltimore. “So it’s nice to have Hubble out there to record these atmospheric changes over time.”
The Great Red Spot dates at least to the 17th century, when the first telescopes revealed it to observers on Earth. It is large enough to contain two or three planets the size of Earth.
The new red spot began as three white ovals, which are cooler, upper-level storms, according to Amy Simon-Miller of NASA’s Goddard Space Flight Center in Greenbelt, Md. One of the three was first spotted in 1939; the other two date to 1915.
In 1998, two of them merged. The third merged into a large white oval the size of Earth in 2000.
“Last year, some amateur astronomers reported the white oval was getting brownish,” Simon-Miller said. Then early this year, it turned red, shocking professional astronomers.
Some astronomers believe the most likely explanation for the color change is that the storm is dredging up material from deep in Jupiter’s atmosphere, which turns red after reacting chemically with the sun’s ultraviolet light.
One scientist, Phil Marcus of the University of California, Berkeley, had predicted such a result several years ago as part of a change in the planet’s climate.
Observing climate change on another planet would be a major scientific event, astronomers said.
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