You see Jupiter is far bigger than any world we've visited yet, and if we got too close to him the _Astronef's_ engines might not be powerful enough to drive us away again.

Then we should either stop there till the R.Force was exhausted or be drawn towards him and perhaps drop into an ocean of molten rock and metal." "Thanks!" said Zaidie, with a shrug of her shapely shoulders.

"That _would_ be an ignominious end to a journey like this, to say nothing of the boiling oil part of it; so I suppose you'll make stopping-places of the satellites and use their attraction to help you to resist His Majesty's." "Your Ladyship's reasoning is perfect.

I propose to visit them in turn, beginning with Calisto.

I shouldn't be at all surprised if we found something interesting on them.