The satellites were no
longer mere points or tiny discs, but distinct moons, with surfaces
marked like that of our own satellite, though far less mountainous and
broken, and, as it seemed to me, possessing a distinct atmosphere. I
am not sure that there is not a visible difference of brightness among
them, not due to their size but to some difference in the reflecting
power of their surfaces, since the distance of all from the Sun is
practically equal That Jupiter gives out some light of his own, a
portion of which they may possibly reflect in differing amount
according to their varying distance, is believed by Martial
astronomers; and I thought it not improbable. The brilliant and
various colouring of the bands which, cross the face of the giant
planet was wonderfully brought out; the bluish-grey around the poles,
the clear yellowish-white light of the light bands, probably belts of
white cloud, contrasted signally the hues--varying from deep
orange-brown to what was almost crimson or rose-pink on the one hand
and bright yellow on the other--of different zones of the so-called
dark belts.
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