An angular observation showed that they were within fifty miles of the surface of the undiscovered world.
"Well, we shall find air here of some sort, there's no doubt.

We'll drop a bit further and then Andrew shall start the propellers.

They'll very soon give us an idea of the density.

Do you notice the change in the temperature?
That's the diffused rays instead of the direct ones.

Twenty miles! I think that will do.