Which of these was NOT seen telescopically by Galileo?

Name: Which of these was NOT seen telescopically by Galileo?
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Galileo observed sunspots, craters and mare on the Moon, Venus' phase cycle, and four moons around Jupiter through his telescope. However, he did not observe stellar parallax, which is the apparent shift in position of a star due to Earth's orbit around the Sun. This phenomenon was not observed until much later due to the need for more precise instruments.

Which of These Was NOT Seen Telescopically by Galileo