in it in a gaseous state.
If, as we have said, the sun were a ball nine feet across, our earth would, in proportion, be the size of a one-inch ball,.
It is well to understand how empty is space.
Night by night their positions change with regard to the fixed stars.
These shine in the sky because they reflect the light of the sun; they are near enough for us to note their movements quite easily.
About it at great distances circle not only our earth, but certain kindred bodies called the planets. in it in a gaseous state