Hubble's image of Jupiter and Io
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Hubble captures Jupiter and Io
News story originally written on October 4, 1996
NASA'S Hubble Space Telescope has taken a rare joint portrait of Jupiter
and its volcanically active moon Io, as the moon passes above the turbulent
clouds of the giant gas planet.
The conspicuous black spot on Jupiter visible in the crisp black-and-
white image is Io's shadow. The shadow, about the size of Io (2,262 miles
across), sweeps across the face of Jupiter at 38,000 miles per hour as the
moon orbits 261,600 miles overhead. The smallest
details visible on Io and Jupiter are about 100 miles across. Bright
patches visible on Io are regions of sulfur dioxide frost. Io is roughly
the same size as Earth's Moon.
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