Which of these was NOT seen telescopically by Galileo?

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Galileo was not able to observe stellar parallax due to the limitations of his telescopes and the distance of stars. It was only observed later by Friedrich Bessel in the 19th century. Galileo was not able to observe stellar parallax due to the limitations of the telescopes at the time. It was only later, with more advanced equipment and technology, that stellar parallax was able to be observed.

Which of These Was NOT Seen Telescopically by Galileo