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Celestial Objects

Celestial Objects. What are celestial objects?. Everything in outer space Stars Planets Comets Asteroids & Meteors Solar System vs Galaxy vs Universe What’s the difference? SIZE?!. Celestial Sphere. Imaginary sphere around the earth that all objects appear to be on. Motions in space.

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Celestial Objects

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  1. Celestial Objects

  2. What are celestial objects? • Everything in outer space • Stars • Planets • Comets • Asteroids & Meteors • Solar System vs Galaxy vs Universe • What’s the difference? • SIZE?!

  3. Celestial Sphere • Imaginary sphere around the earth that all objects appear to be on.

  4. Motions in space • Everything moves in space. • Why? Because of gravity. • Yes there is gravity everywhere.

  5. Motions in space • Orbits • Movement of planets around a central body that is elliptical • Rotation • Planetary movement on its axis • Revolution • Planets moving around on its orbit

  6. Gravity • This is the force that pulls on other objects. • What causes it? • Mass of an object causes an attraction between them. • So if you have mass there is gravity.

  7. Newton • Gravity has three laws • 1st law • Object at rest will stay at rest until acted upon by another force. • 2nd law • An object will move if the force is greater then the mass. • 3rd law • When an object applies a force on a surface the surface pushes back with equal force.

  8. Rotation • Earth rotates 15 o per hour

  9. Open to page 5 • Answer the questions solo and we will review in 10 minutes. • Use your notes to answer the questions.

  10. Models of our Solar System • Geocentric • Earth Centered. • Circular orbits • Ptolemy, • Retrograde motions • Heliocentric • Sun Centered • Circular orbits • Copernicus, Kepler and Galileo • Daily movements

  11. Proof of Heliocentric models • Pendulum • As the earth rotates it allows the pendulum to swing. • Because the pendulum swings and moves that means the Earth rotates.

  12. Famous dead guys • Newton – Laws of gravity • Ptolemy – Geocentric model • Copernicus – Heliocentric model

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