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