Discusses the concepts of time and biological cycles, including the phases of the moon, the internal clocks of plants and animals, seasonal rhythms, and the aging process.

An overview of astronomy covering topics such as the solar system, Earth's moon, moon phases, constellations, other solar systems, and more.

Presents information about the moon, including fast facts, history, and technology used to study it.

Answers questions about the solar system, including which planet in the solar system is the biggest, are there volcanoes on Mars, and more.

Introduces young readers to the mysteries of the Universe, discussing the planets, the stars and galaxies, weather, space travel, rockets, and the future in space.

Presents a tour of Mercury, Venus, Earth and its moon, and Mars and explains how they revolve around the sun, providing statistics and diagrams and discussing the physical properties and conditions of the inner planets.

Describes the characteristics, causes, and effects--such as tornadoes and floods--of El Niño and La Niña events, as well as methods of predicting and studying them.

Presents a collection of illustrated poems that describe the different seasons of the year.