Branley, Franklyn Mansfield

Describes how sunshine and the tilt of the earth's axis are responsible for the changing seasons.

Describes the various properties of air and shows how to prove that air takes up space and that there is air dissolved in water.

Text and pictures describe what a trip to Mars might be like.

An astronomical exploration of the Star of Bethlehem against a background of the Christmas story.

Describes the beginning of the Earth, from the formation of the planets out of a dust-and-gas cloud to the formation of continents on Earth.

Discusses some of the ideas and misconceptions about life in outer space and speculates on the existence of such life in light of recent space explorations.

A guide to astronomical and meteorological events typical of each month, from the beginning of winter through summer's meteor showers and hail to the harvest moon of autumn.

Explains in simple text and illustrations what is known about the force of gravity.