Galileo desired to use his telescope to make more discoveries in the heavens, but his instrument was too small. He made another and larger telescope which magnified eight times, and then another which magnified thirty times, and pointed it at the moon. His heart leaped with joy, for he saw what no human eye had ever before seen — ranges of mountains, deep hollows, and broad plains! He turned his telescope on the planets, and found they appeared with disks like the moon at a quarter full. He turned it on the Milky Way, and beheld innumerable tiny stars.

Galileo made several telescopes because

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