comets

Describes the origin, composition, orbit, and speed of different types of comets.

Discusses the characteristics of comets, meteors, and asteroids, their relationship to and effects on the earth, and what they reveal about the history of the universe.

Describes dwarf planets and other celestial bodies within the solar system, including asteroids, comets, and meteors, and discusses the nature of the solar system and how and why satellites move in orbit.

Explains the wonders of space, comets, asteroids, extraterrestrial objects, and meteors.

Simple answers to children's questions about comets and meteors. What are they? Where do they come from? Where do they go? Why do they glow?.

Presents an investigation of asteroids and comets, discussing ancient beliefs about the appearance of comets, their demystification with the emergence of modern astronomy, how they formed, and their different types and composition, and looking at the possibilities for mining asteroids, as well as what happens when they hit Earth.

Provides information about comets, space objects made of frozen water, gases, and dust that orbit around the sun, and includes a word hunt and definitions.

Examines the physical characteristics and conditions of comets, asteroids, and meteorites, describing their position and movements in relation to the sun and planets and surveying humanity's attempts to penetrate their mysteries.

A photo essay of comets and meteors of the past with simple explanations of what comets and meteors are.

Explores the dangers that are floating through space, such as asteroids, space junk, and satellites, discussing where they came from and how scientists watch for them.