Galileo Galilei
ga·li·leo·galilei
noun
1.
Italian astronomer and mathematician who was the first to use a telescope to study the stars; demonstrated that different weights descend at the same rate; perfected the refracting telescope that enabled him to make many discoveries (1564-1642)
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.