Image: Little Red Spot
Amy Simon-Miller / ESA / NASA vi
These images released by NASA show two views of Jupiter's "Little Red Spot," which is about the size of Earth. The image on the left shows a close-up view of the spot (center left,) and at right, a box has been added to show the spot's location on Jupiter.
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updated 10/11/2006 6:09:56 PM ET 2006-10-11T22:09:56

The little brother to the Great Red Spot on Jupiter is getting redder and stronger.

Both spots are actually fierce storms in Jupiter's atmosphere. While the Great Red Spot — at three times the size of Earth — is much more noticeable, strange things are happening to the smaller spot.

Just a little more than a year ago, the Earth-sized spot was a pale white. Now it matches the reddish hue of its bigger sibling and boasts 400 mph winds, according to new data from the Hubble Space Telescope.

Scientists aren't quite sure what's happening to the smaller storm, nicknamed the Little Red Spot or Red Spot Jr. but officially called "Oval BA." It probably gained strength as it shrunk slightly, the same way spinning ice skaters go faster when they move their arms closer, said NASA planetary scientist Amy Simon-Miller. Her findings from the Hubble data were published in the astronomical journal Icarus.

Slideshow: Month in Space: January 2014 As the storm has grown stronger it's probably picked up red material from lower in the Jupiter atmosphere, most likely some form of sulfur which turns red as part of a chemical reaction, she said.

The color change took astronomers by surprise. And now they figure more surprises are in store as the solar system's largest planet goes into hiding from Earth's prying eyes until January, moving behind the sun.

"We found that Jupiter tends to do interesting things behind the sun and we can't see it," Simon-Miller said.

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