Contents Comets Asteroids and Meteors 4 Comets Asteroids and Meteors Fact Files What Is a Comet 6 The Comet’s Tail 8 Halley’s Comet 10 Asteroids 12 What Are Asteroids 14 Asteroid Crash 16 What Is a Meteor 18 What Is a Meteorite 20 Quiz 22 Useful Words 23 Find Out More 23 Index 24
Comets Asteroids and Meteors Pieces of rock fly around in space Comets are lumps of ice and dust Asteroids are big rocks Smaller rocks are meteoroids FACT FILE Asteroid lump of space rock smaller than a planet Comet giant ball of ice and rock Meteor small meteoroid that burns up in Earth’s atmosphere Meteorite small meteoroid that crashes on Earth The tail of a comet can be millions of miles long
Comets Asteroids and Meteors Asteroids circle the Sun Mini Facts An asteroid crashes to Earth about once every 500,000 years
