TY - BOOK AU - Orme,Helen AU - Orme,David TI - Let's explore comets and asteroids T2 - Blast off SN - 0836879473 AV - QB721.5 .O76 2007 U1 - 523.44 22 PY - 2007/// CY - Tunbridge Wells, Kent PB - Ticktock Entertainment KW - Asteroids KW - Juvenile literature KW - Comets KW - sears N1 - Includes index; The solar system -- What is an asteroid? -- Where are asteroids? -- Hunting for asteroids -- What is a comet? -- Where are comets? -- Comets and the Earth -- What can we see? -- Early sightings -- Space missions; 3-6 N2 - Explains what asteroids and comets are made of and where they come from, describes impacts with Earth, and discusses the history of scientific research into them ER -