This volume contains complete stories and essays by Giovanni Schiaparelli, Alfred Russel Wallace, Daniel Kirkwood, Emanuel Swedenborg, and Fenton Ash. The works included in this volume are:

“The Planet Mars,” by Giovanni Schiaparelli

“Is Mars Habitable?,” by Alfred Russel Wallace

“The Asteroids, or Minor Planets Between Mars and Jupiter,” by Daniel Kirkwood

“Earths in Our Solar System Which Are Called Planets and Earths in the Starry Heaven,” by Emanuel Swedenborg

“A Trip to Mars,” by Fenton Ash