THE SOLAR SYSTEM Chapter 24A. Unit Objectives Compare models of the solar system To list and describe the objects in our solar system.

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Presentation transcript:

THE SOLAR SYSTEM Chapter 24A

Unit Objectives Compare models of the solar system To list and describe the objects in our solar system

Ideas about the Solar System Early people:  Everything goes around Earth  Geocentric Greeks:  Everything fixed on spheres that go around Earth  Geocentric Nicolaus Copernicus ( ):  The center of Earth is not the center of the universe or of gravity  Motion of the sky is due to Earth’s motion  The sun is the center of the solar system  Heliocentric

Ideas about the Solar System Galileo Galilei ( ):  Used telescope (new invention) to look at planets and sun  Phases of Venus, sunspots and moons of Jupiter evidence to support heliocentric solar system Tycho Brahe ( ):  Careful, detailed observations of stars and planets without telescope Rudolphine Tables  Proposed geo-heliocentric model of solar system  Sun and moon orbit Earth, everything else orbits sun Johannes Kepler ( ):  Brahe’s assistant  Used data to formulate laws of planetary motion

Kepler’s Laws of Planetary Motion Published in defense of heliocentric views The laws:  The orbit of every planet is an ellipse, with the sun at one of the foci  A line joining the sun and the planet sweeps out equal areas in equal times  In other words  The square of the period of a planet’s orbit is directly proportional to the cube of that planet’s distance from the sun  In other words

Modern view of Solar System Made up of planets and other objects that orbit the sun The sun contains 99.86% of the total mass in the solar system  Gravity holds objects in orbits  The Solar System - Astronomy For Kids - KidsAstronomy.com The Solar System - Astronomy For Kids - KidsAstronomy.com