A History of Astronomy Ptolemy ( 90- 168 AD ) geocentric theory.

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Presentation transcript:

A History of Astronomy Ptolemy ( 90- 168 AD ) geocentric theory

Nicolas Copernicus ( 1473 – 1543 ) heliocentric theory

Galileo Galilea ( 1564 – 1642 ) invented telescope discovered moons of Jupiter

Tycho Brahe ( 1546 – 1601 ) plotted orbit of Mars

Johannes Kepler ( 1571 – 1630 ) Three Laws of Planetary Motion

Isaac Newton ( 1643 – 1727 ) Discovered Law of Universal Gravitation

Law of Universal Gravitation: The attractive force between two objects is: -directly proportional to the product of the masses -inversely proportional to the square of the distance between them