Earth

What was the nationality of the scientist who demonstrated a heliocentric system?

More Questions from Earth
Which is heavier, cold air or warm air?
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Which scale is used to describe a mineral's hardness?
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Hanging valleys may occur in all of the following ways except?
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How many sides of a peninsula are surrounded by water?
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According to the International Flat Earth Society, where is the hub of the world?
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What are large bodies of air with similar temperatures and moisture content called?
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Mount St. Helens erupted in what U.S. state?
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Which is the largest planet in Earth's solar system?
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