The Renaissance astronomer who wrote the pioneering book that suggested the Earth probably orbits the Sun was Copernicus.
An astronaut observes and performs the experiments based on the universe.
The astronomer observes the universe and its components closely using telescope being on the Earth. While the astronaut goes into space to look in closely.
The astronomer who gave the observation that Earth is orbiting around the Sun was Nicolaus Copernicus.
Thus, the correct option is Copernicus.
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