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Measured time using sundials and water clocks, and studied astronomy in attempt to predict future events.
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Said that all the planets revolve around the Earth
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Made thousands of measurements and cataloged over 850 stars
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Thought that the Earth was round
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Thought that the Sun was the center of the universe and that everything revolved around it.
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Invented the telescope.
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- Described the movement of the planets with his laws of motion.
- Motion of the planets was explained with his theory of gravity.
- Suggested that the Earth’s gravity caused the moons orbit.
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Predicted that there was an undiscovered planet behind Uranus… Neptune was discovered twelve years later.
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- Suggested that our galaxy is one of billions and that the universe is expanding.
- The Hubble telescope is named after him.
- Einstein had calculated that the universe was either expanding or contracting in 1917, but refused to believe his own predictions.
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- Showed that time does not pass at the same speed everywhere.
- Predicted the existence of black holes.
- Said that a rocket travelling at the speed of light will have a higher mass than one not moving.