A dead world bigger than the Moon, and made of gold and silver sponge, wouldn't be a nice thing to have too near the Earth.

There's trouble enough about that sort of thing at home as it is.
Still, it'll be a nice addition to the museum, and if you'll put it away and go and wash your hands lunch will be ready." When they got back to the deck-chamber Calisto was already a half moon in the upper sky nearly five hundred thousand miles away, and the full orb of Ganymede, shining with a pale golden light, lay outspread beneath them.

A thin, bluish-grey arc of the giant planet overarched its western edge.
"I think we shall find something like a world here," said her ladyship, when she had taken her first look through her telescope; "there's an atmosphere and what look like thin clouds.

Continents and oceans too, or something like them, and what is that light shining up between the breaks?
Isn't it something like our Aurora ?" "It might be," replied Redgrave, turning his own telescope towards the northern pole of Ganymede, "though I never heard of a satellite having an aurora.

Perhaps it's the Sun shining on the ice." As the _Astronef_ fell towards the surface of Ganymede she crossed his northern pole, and the nearer they got the plainer it became that a light very like the terrestrial Aurora was playing about it, illuminating the thin, yellow clouds with a bluish-violet light, which made magnificent contrasts of colouring amongst them.
"Let us go down there and see what it's like," said Zaidie.