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Observing the Solar System Section 1

Chapter 20 – The Solar System. Observing the Solar System Section 1. Observing the Solar System. Wander-ing Stars. Ancient Greeks watched the stars move across the sky. 5 points of light seemed to wonder among all the stars. Greeks called objects planets meaning “wondering star.”

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Observing the Solar System Section 1

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  1. Chapter 20 – The Solar System Observing the Solar SystemSection 1

  2. Observing the Solar System Wander-ing Stars • Ancient Greeks watched the stars move across the sky. • 5 points of light seemed to wonder among all the stars. • Greeks called objects planets meaning “wondering star.” • Later, ancient Romans gave names to the planets Mercury, Venus, Mars, Jupiter, and Saturn.

  3. Observing the Solar System Greek Ideas: Earth at the Center • Greek scientists including Aristotle, thought that the Earth was at the center of the universe. • This was known as the geocentric system where Earth is at the center of the revolving planets. • A Greek scientist Ptolemy furthered the geocentric idea by adding that planets also move in smaller circles as they revolve around the Earth. Image From: ptolemy.berkeley.edu

  4. Observing the Solar System Ptolemy ‘s Ideas About the Universe Image From: vikdhillon.staff.shef.ac.uk

  5. Observing the Solar System Copern-icus’s Idea: Sun at the Center • A Polish astronomer, Nicholas Copernicus, thought that the sun was the center of the universe. • This was called a heliocentric system where the Earth and the other planets revolve around the sun. Image From: bbc.co.uk

  6. Observing the Solar System Galileo’s Observ-ations • Galileo was the first to use a telescope to look at objects in the sky and provide proof for Copernicus’s ideas about a heliocentric system. Image From: news.bbc.co.uk

  7. Observing the Solar System Kepler • Johannes Kepler determined the shape of the planets’ orbits to be elliptical. Image From: ph.surrey.ac.uk

  8. Solar System FACTS • Number of Planets: 8 • Number of Dwarf Planets: 5

  9. Solar System FACTS • Names of Rocky Planets: Mercury, Venus, Earth, Mars • Names of Gas Giants: Jupiter, Saturn, Uranus, Neptune

  10. Solar System FACTS • Planet with the Most Moons: Saturn – 53 known moons • Planet with the Least # of Moons: Mercury and Venus – 0 moons

  11. Solar System FACTS • Number of Asteroids: 535,815 • Estimated Value of Asteroids in Belt: $100,000,000 for every person on Earth • Number of Comets: 3,061 known

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