Oct 16 1995
From The Space Library
The HST has discovered ozone on Jupiter's satellite Ganymede, making it one of the solar system's rare moons that have atmospheres. Ganymede's ozone is produced when it passes through charged particles trapped in Jupiter's powerful magnetic field. (Av Wk, Oct 16/95)
HST has also imaged bright auroras of Saturn's northern and southern poles in far ultraviolet light. The circular band centered on the north pole is an enormous auroral curtain rising as far as 1,200 miles above the cloudtops. This curtain changed rapidly over the two hour period of Hubble observations. The aurora is produced as trapped charged particles collide with atmospheric gases-molecular and atomic hydrogen in Saturn's case. (Av Wk, Oct 16/95; Science, Aug 18/95)
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