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