6. Which of the following celestial bodies has tail made of dust or gas particles? A. comets B meteor C. meteorite D. meteoroid 7. What do comets and meteors have in common? A. Both have mails. B. Both are made of rocks and ice. C. Both are located at Kuiper and Oort belt. D. Both are remnants of the formation of solar system and rocky in composition. 8. What is the bright glow around the head” of a comet? A coma B. crown C. halo D. ring 9. What is the correct term for a "shooting star"? A. Asteroid B. Comet C. Falling star D. Meteor 10. Which Near-Earth Objects(NEO) are found on the Kuiper Belt and Oort Cloud? A. asteroids B. Comets C. Meteors D. Meteorites​