Suppose you were writing a summary of the article. Which would be most important to put in the summary?
New tools have helped people better understand our solar system.
Copernicus used a quadrant to map how the planets moved.
Galileo Galilei was an Italian scientist who lived a long time ago.
The telescope was not invented until around 400 years ago.
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The most important point to include in the summary would be that new tools have helped people better understand our solar system.
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