A) how to become an astronomer and learn to write books. B) traveling comets that can change our lives C) what comets are made of and how they move and change D) when the next solar system will appear in the universe
A) gives information about the solar system B) tells how to make something C) is written in the first person D) took place long ago
A) a full moon B) the sun C) a group of stars D) a flaming ball
A) Bad things always happened after a comet appeared. B) People did not understand comets. C) Comets appeared in the sky suddenly. D) Earthquakes and floods occurred after a comet appeared.
A) solar wind B) fluorescent light bulb C) shooting star D) dirty snowball
A) dentists B) astronauts C) astronomers D) doctors
A) past the farthest planet B) around the sun C) between the planets D) behind the moon
A) gravity B) a planet C) an asteroid D) a coma
A) boulders B) meteors C) comets D) asteroids
A) a large rock B) a ball of frozen gases C) chunks of ice D) a star
A) dust B) rocks C) ice D) gas and dust
A) years B) ellipses C) loops D) periods
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