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Arrangement & Movement of Objects in Our Solar System

Arrangement & Movement of Objects in Our Solar System. …and who figured it all out?. Rotating vs. Revolving. Planets REVOLVE around the SUN . This means they travel around the sun in a path , like they are running around on a track . Planets ROTATE ( spin like a top )

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Arrangement & Movement of Objects in Our Solar System

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  1. Arrangement & Movement of Objects in Our Solar System …and who figured it all out?

  2. Rotating vs. Revolving Planets REVOLVEaround the SUN. This means they travelaroundthe sun in a path, like they are runningaround on a track. Planets ROTATE (spin like a top) on an imaginary AXIS Planets revolve around suns. Moons revolve around planets. ALL of them rotate while they revolve. One complete rotation takes 24 hours One complete revolution takes 365 ¼ days!

  3. WHAT IS AN ORBIT? AN ORBITis the PATHeach planet follows to REVOLVEaround the sun. Every planet has ITS OWN ORBIT. Orbits are NOTcircular-shaped. The shapeof each planet’s orbit is called an ELLIPSE. An ellipse is an OVALSHAPE. The closera planet is to the sun, the shorterits orbitwill be around the sun. Mercurytakes 88 daysto ORBITthesun. Neptunetakes almost 165 YEARS!

  4. Which TWO FORCES keep planets in their orbit? INERTIA: Planets are all moving out toward outer space in a straight line. INERTIA GRAVITY: -a pulling force The more mass an object has, the more gravity (pull) it has. The sun has a LOT of gravity, which causes the planets trying to move past it to be pulled towards it. The planets also pull a little on the sun! GRAVITY

  5. PTOLEMY & ARISTOTLE-The GEOCENTRIC Model- • They believed we were inside a closed, solidsphere with the stars pasted on the inside! • This is called the GEOCENTRICmodel of our solar system. • Ancient Greeks like Ptolemy & Aristotle believed that EARTH was at the center with the sun and all the planetsrevolving around it!

  6. COPERNICUS & GALILEOThe HELIOCENTRIC Model Around 1500, a Polishastronomer named Copernicus claimed Earth was NOT at the center of the solar system. He stated that the SUN was at the center, with all the planets revolving around it. Around 1600, an Italianastronomer named Galileodesigned one of the firsttelescopes & used it to make observations that proved the sun was at the center of our planetary system. This model of our planetary system is called the HELIOCENTRIC model. This was very controversial as the church preferred the belief that Earth was at the center.

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