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Author Archives: Anonymous

Who taught that the Earth is stationary and at the center of…

Who taught that the Earth is stationary and at the center of the universe with the sun, the moon, and the planets moving around Earth in perfect circles?

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What defines a closed orbit?

What defines a closed orbit?

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What contribution did Tycho make that contradicted Aristotle…

What contribution did Tycho make that contradicted Aristotle’s model of a perfect starry sphere?

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Galileo’s observations of the phases of Venus proved that __…

Galileo’s observations of the phases of Venus proved that ____.

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A full moon occurs when ____.

A full moon occurs when ____.

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The Milankovitch Hypothesis states changes in the Earth’s he…

The Milankovitch Hypothesis states changes in the Earth’s heat balance can be due to __.

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What types of distances are typically listed in astronomical…

What types of distances are typically listed in astronomical units (AU)? 

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What is perigee?

What is perigee?

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Because the Earth rotates on its axis, the ____.

Because the Earth rotates on its axis, the ____.

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A light-year is ____.

A light-year is ____.

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