Presentation on theme: "Solar System Geocentric = Earth (geo) is center of universe Heliocentric = Sun (helio) is center of universe Which is correct? Heliocentric… proved by."— Presentation transcript:
Solar System Geocentric = Earth (geo) is center of universe Heliocentric = Sun (helio) is center of universe Which is correct? Heliocentric… proved by Copernicus and Galileo.
Solar Nebula Theory How to make a solar system: 1.Start with nebula = a large cloud of dust and gas. 2.The nebula begins to spin and contract from gravity. This creates a flattened disk. ie: pizza, skirt on spinning ice skater.
Solar Nebula Theory 3.The middle of the disk reaches high temp. and ignites! Nuclear Fusion = when lighter elements combine into heavier elements (Hydrogen + Hydrogen = Helium) 4. Voila… a star is formed.
Planet Formation Dust and rocks begin to clump together… like a snowball = accretion. Planetesimals = objects size of small moons with gravitational fields. Differentiation = dense materials sink to form core, light materials float and form crust.
Planets Definition (2006): 1.Must orbit around the Sun. 2.Enough mass to be a sphere. 3. Cleared the “neighborhood” around its orbit.
Planet Groups Terrestrial Mercury, Venus, Earth and Mars. -- Rocky surface -- Small diameter -- High density -- Few moons Jovian Jupiter, Saturn, Uranus and Neptune. -- No surface -- Large diameter -- Low density -- Many moons
Pluto Pluto resides in Kuiper Belt. In 2005, Eris (same size as Pluto) found in Kuiper Belt. Pluto does not clear out its orbit
Elliptical Orbits All planet have elliptical (oval) orbits. Eccentricity = how flat 1.Two fixed points within ellipse (foci) 2.Sun is at one of the foci. Circle = 0 eccentricity Line = 1 eccentricity