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15
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Which two planets (not including Earth) have been visited by spacecrafts?
Mars and Venus
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Which planet is the second largest?
Saturn
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Which planet is the second smallest?
Mercury
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'Outer Space' begins how many kilometres above Earth?
About 100km
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thief
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5
10
15
20
25
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gift
Win 20 points!
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rocket
Go to first place!
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banana
Go to last place!
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15
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Why is space silent?
Because there is no air! It is a vacuum and sound waves can't travel through a vacuum.
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