TABLE OF CONTENTS Chapter One A Special Planet 4 Chapter Two Flying Astronauts 8 Chapter Three Cool Earth 12 Chapter Four Brainpower 18 Have A Gravity Race 22 Glossary 23 To Learn More 24 Index 24
Chapter One A Special Planet My class is visiting the Space Museum Dr Sally our guide was an astronaut on the International Space Station She holds up a model of Earth I orbited this special planet she says 44
Neptune is my favorite planet I say It’s so big that fifty Earths could fit inside Earth takes 365 days or one year to orbit the or one day sun It spins as it orbits One full spin takes twenty-four hours 5
