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2
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An exploding star that scatters its mass into space.
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4
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What is the name of the force that keeps us from floating off Earth?
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8
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He was the first to argue for philosophical concepts of perfect celestial shapes and motions.
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9
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He determined the length of a year to an accuracy of six minutes.
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11
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Who was the first to propose the idea of a spherical Earth and Moon?
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12
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Who proposed the idea of multiple worlds?
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13
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Who created the helio-centric system?
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14
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What is the name of the Egyptian goddess that swallows the Sun?
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15
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Made in 2400 B.C., this is the most well-known astronomical observatory and calendar.
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20
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Motion of the sunspots indicated that the Sun rotated on an [ ].
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21
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Which country created the first sundial?
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22
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He discovered that sunlight contains 7 colors.
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23
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What civilization was the first to try to explain the universe in an organized, logical manner?
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