Answer :
The planet Neptune was not a discovery that was made by Galileo using the telescope.
The discoverer of this planet was Johann Gottfried Galle. He discovered this planet using the mathematical calculations that were done by Urbain Verrier and John Adams.
Neptune cannot be viewed except with the use of a telescope. Although Galileo was the first to view the heavenly bodies using this invention in the year 1609, it is suggested that he may have seen neptune but failed to recognize it as a planet.
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