The point of view of this book is human interest in the other worlds around us.

Around Mars, in particular, a lively war of opinions rages.

Saturn is the second of the major, or Jovian, group of planets, and is situated at a mean distance from the sun of 886,000,000 miles.

There is no other planet that has a moon relatively as large as ours.

There is no reason why everybody should not know the principal planets at sight nearly as well as everybody knows the moon.