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Observing the Solar System

Observing the Solar System. Greek Observations. Greek astronomers believed Earth to be the center of the universe. This is known as a geocentric system. The Copernican Revolution.

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Observing the Solar System

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  1. Observing the Solar System

  2. Greek Observations • Greek astronomers believed Earth to be the center of the universe. This is known as a geocentric system.

  3. The Copernican Revolution • Copernicus thought that the sun is at the center of the system of planets. This system is called a heliocentric system.

  4. Galileo's Evidence • Galileo Galilei used the newly invented telescope to make discoveries that supported the heliocentric model. • Galileo saw 4 moons revolving around Jupiter, proving not everything revolves around Earth. • Galileo saw Venus go through a series of phases, which wouldn’t happen if it only circled around Earth.

  5. Kepler’s Calculations • Kepler, who was once the assistant to a successful astronomer that died before their research was complete, had concluded from his calculations that the orbit of each planet is an ellipse instead of a perfect circle.

  6. Modern Discoveries • Since Galileo’s time, we have discovered Uranus, Neptune, and Pluto (which is no longer a planet). • Today we know that the solar system consists of the sun, the planets and their moons, and several kinds of smaller objects that revolves around the sun.

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