One of galileo's contributions to science was
creating the coordinate plane system.
developing the scientific method.
improving the telescope.
inventing the astrolabe.
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developing the scientific method.

Explanation:

He was the first to ever use what we now know as the scientific method. He used the scientific method to study space and look at planets and our moon. He is referred to as the father of observational astronomy

René Descartes made the coordinate plane system.

Johannes Kepler improved the telescope.

Apollonius of Perga invented the astrolabe.

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