Multiple choice general knowledge

Galileo was an Italian astronomer who

  1. developed the telescope

  2. discovered four satellites of Jupiter

  3. discovered that the movement of pendulum produces a regular time measurement

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Galileo did all three: he significantly improved the telescope design (though didn't invent it), discovered four moons of Jupiter (the Medicean stars), and discovered the pendulum's isochronism which led to accurate timekeeping. While the first option is slightly imprecise, the question intends D as the correct answer.

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