Who used the telescope first time in history to observe Jupiter, Saturn and Venus?

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Who used the telescope first time in history to observe Jupiter, Saturn and Venus? Answer: Galileo Galilei

Galileo Galilei was among the first astronomers to use a telescope for systematic astronomical observations, including planets such as Jupiter, Saturn and Venus.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the GHQ Army Selection & Recruitment Directorate (Civilian Personnel Wing) preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.