"We next spread our wings for a very long flight. In passing through the "asteroid" zone of solar space, about 260 millions of miles from the sun, we may chance to fall in with some worlds of smaller dimensions than those we have been contemplating. We know very little about them, except that their ways are eccentric and mysterious. At length the shores of huge _Jupiter_ are reached at a distance of nearly 500 millions of miles from the sun. To carry on the comparison, he is a "small orange" to the "pea" of our earth, or to the two feet globe that represents the sun. His orbit is a path 3,000 millions of miles long, which he accomplishes in an "annual" period of about 12 of our years. The sun's light has now shrunk considerably; but four brilliant moons or satellites, one or more of which are always "full," help to afford some compensation. But let us "onward" in our "outward-bound" course. We again pass through a space of nearly equal distance as that of _Jupiter_ from the sun. We are now more than 900 _millions_ of miles distant from the central pivot. Here we fall in with _Saturn_, whose comparative size may be represented by an orange considerably smaller than the last (bear in mind the comparative sizes, our earth as a "_pea_" to these each an orange). His year swallows up almost thirty of our own. And in this far distant region the Sun, though giving only about one ninetieth part of the light which we receive, is still equal to 300 full moons, and is at least sufficient for vision, and all the necessary purposes of life, while no fewer than eight satellites supplement the waning sun-light, besides a mysterious luminous "ring" of vast proportions. "Twice as far away from the Sun as Saturn, _Uranus_, represented by a _cherry_, plods his weary course. Although his real diameter is 35,000 miles, his circumference over 100,000, being more than four times the size of our own earth, yet he is rarely seen by the naked eye. His annual journey round the Sun is 10,000 millions of miles, and he consumes what we should consider a lifetime, 84 _years_, in getting over it. Our little _earth_ has now faded out of sight. "Only a few years ago, _Uranus_ was the last planetary station of our system, but the discovery of Neptune in 1846, gave us another resting-place on the long journey into space. Here, at a distance of nearly 3,000 _millions_ of miles from the Sun, we may pause awhile before entering upon the more remote exploration of the '_starry_ universe.' "We are approaching the frontier regions of our system, and the Sun's light and the power of his attraction are gradually passing away. Between the shores of our Sun-system and the shores of the nearest star-system--they also being suns--lies a vast, mysterious chasm, in the recesses of which may still lurk some undiscovered planets, but into which, so far as we yet know, the wandering comets alone plunge deeply.