ARE THERE OTHER PLANETS?
Reading edition
Inasmuch as some of the planets known to us have only been discovered so lately (relatively) the question has naturally been asked: “Why may there not be other planets, beyond Neptune, still undiscovered?” It is a perfectly legitimate question, and no definite answer to this query can be given. It seems rather improbable that another planet will be discovered. However, it is a conceivable possibility, and M. Flammarion has stated that, in his estimation, such a planet probably exists—gravitating at a distance 48 times as great as the distance between the earth and the sun—that is to say, 7,500 million miles, in an immense orbit which it takes at least 330 years to accomplish. Proof as to the existence of such a planet has not, however, as yet been forthcoming.