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News Release 637 of 964

August 5, 1999 12:00 PM (EDT)

News Release Number: STScI-1999-29

Hubble Views Ancient Storm in the Atmosphere of Jupiter

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Image: The Great Red Spot: An Ancient Storm in Jupiter's Atmosphere

The Great Red Spot: An Ancient Storm in Jupiter's AtmosphereSTScI-PRC1999-29

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ABOUT THIS IMAGE:

When 17th-century astronomers first turned their telescopes to Jupiter, they noted a conspicuous reddish spot on the giant planet. This Great Red Spot is still present in Jupiter's atmosphere, more than 300 years later. It is now known that it is a vast storm, spinning like a cyclone. Unlike a low-pressure hurricane in the Caribbean Sea, however, the Red Spot rotates in a counterclockwise direction in the southern hemisphere, showing that it is a high-pressure system. Winds inside this Jovian storm reach speeds of about 270 mph.

The Red Spot is the largest known storm in the Solar System. With a diameter of 15,400 miles, it is almost twice the size of the entire Earth and one-sixth the diameter of Jupiter itself.

The long lifetime of the Red Spot may be due to the fact that Jupiter is mainly a gaseous planet. It possibly has liquid layers, but lacks a solid surface, which would dissipate the storm's energy, much as happens when a hurricane makes landfall on the Earth. However, the Red Spot does change its shape, size, and color, sometimes dramatically. Such changes are demonstrated in high-resolution Wide Field and Planetary Cameras 1 & 2 images of Jupiter obtained by NASA's Hubble Space Telescope, and presented here by the Hubble Heritage Project team. The mosaic presents a series of pictures of the Red Spot obtained by Hubble between 1992 and 1999.

Astronomers study weather phenomena on other planets in order to gain a greater understanding of our own Earth's climate. Lacking a solid surface, Jupiter provides us with a laboratory experiment for observing weather phenomena under very different conditions than those prevailing on Earth. This knowledge can also be applied to places in the Earth's atmosphere that are over deep oceans, making them more similar to Jupiter's deep atmosphere.

The Hubble images were originally collected by Amy Simon (Cornell U.), Reta Beebe (NMSU), Heidi Hammel (Space Science Institute, MIT), and their collaborators, and have been prepared for presentation by the Hubble Heritage Team.

Object Name: Jupiter

Image Type: Astronomical

Credit: The Hubble Heritage Team (STScI/AURA/NASA) and Amy Simon (Cornell U.)

NEWS RELEASE IMAGES

The above montage includes these images:

Jupiter -- June 1999 Image Type: Astronomical Jupiter -- June 1999PRC1999-29a1 Jupiter WFPC1 May 1992 Image Type: Astronomical Jupiter WFPC1 May 1992PRC1999-29b1 Jupiter WFPC2 July 1994 Image Type: Astronomical Jupiter WFPC2 July 1994PRC1999-29b2 Jupiter WFPC2 August 1994 Image Type: Astronomical Jupiter WFPC2 August 1994PRC1999-29b3 Jupiter WFPC2 February 1995 Image Type: Astronomical Jupiter WFPC2 February 1995PRC1999-29b4 Jupiter WFPC2 October 1995 Image Type: Astronomical Jupiter WFPC2 October 1995PRC1999-29b5 Jupiter WFPC2 October 1996 Image Type: Astronomical Jupiter WFPC2 October 1996PRC1999-29b6 Jupiter WFPC2 June 1999 Image Type: Astronomical Jupiter WFPC2 June 1999PRC1999-29b8

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