Answer:
a. the rotation of the stars
Explanation:
Galileo Galilei was an Italian astronomer who lived at the end of the 16th and the beginning of the 17th century, during the Renaissance. He was the first astronomer in using the telescope to observe celestial bodies. Through his telescope, he observed the Moon's terrain, the Sun's imperfection, and the phases of Venus. All these observations were direct evidence that supported the Heliocentric model proposed by Copernicus.
One of the things that Galileo could not observe with his rudimentary telescope was the rotation of the stars, it is the fact that the stars rotate around their axis. It was not possible back then to directly see this event because telescopes lacked the necessary optical technology to observe this phenomenon.
Galileo was an famous and renowned astronomer of Italy. He survived during the late 16th and the early 17th century. He used his telescope to observe the events of solar system. The observations of Galileo does not include the rotation of the stars and OPTION A is correct.
Therefore the observations of Galileo does not include the rotation of the stars and OPTION A is correct.
Learn more about Galileo here:
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