Imagine a hurricane that lasted for 300 years! Jupiter's Great Red Spot indeed seems to be a giant hurricane-like storm system [
http://www.coaps.fs
] rotating with the Jovian clouds. Observed in 1655 by Italian-French astronomer Jean-Dominique Cassini [
http://www.jpl.nasa
] it is seen here over 300 years later - still going strong - in a mosaic of recent Galileo spacecraft images [
http://www.jpl.nasa
]. The Great Red Spot is a cold, high pressure area 2-3 times wider than planet Earth. Its outer edge rotates in a counter clockwise direction [
http://bang.lanl.go
] about once every six days. Jupiter's own [
http://seds.lpl.ari
] rapid rotation period [
http://www.kalmbach
] is a brief 10 hours. The Solar System's largest gas giant planet [
http://antwrp.gsfc.
], it is presently well placed [
http://antwrp.gsfc.
] for evening viewing [
http://www.kalmbach
]. (APOD thanks to Alan Radecki for assembling a preliminary mosaic from the Galileo imagery!)
Explanation
Imagine a hurricane that lasted for 300 years! Jupiter's Great Red Spot indeed seems to be a giant hurricane-like storm system [
http://www.coaps.fs
] rotating with the Jovian clouds. Observed in 1655 by Italian-French astronomer Jean-Dominique Cassini [
http://www.jpl.nasa
] it is seen here over 300 years later - still going strong - in a mosaic of recent Galileo spacecraft images [
http://www.jpl.nasa
]. The Great Red Spot is a cold, high pressure area 2-3 times wider than planet Earth. Its outer edge rotates in a counter clockwise direction [
http://bang.lanl.go
] about once every six days. Jupiter's own [
http://seds.lpl.ari
] rapid rotation period [
http://www.kalmbach
] is a brief 10 hours. The Solar System's largest gas giant planet [
http://antwrp.gsfc.
], it is presently well placed [
http://antwrp.gsfc.
] for evening viewing [
http://www.kalmbach
]. (APOD thanks to Alan Radecki for assembling a preliminary mosaic from the Galileo imagery!)
Explanation