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Transcript
TOPIC 4: EARTH IN THE UNIVERSE “CELESTIAL ADDRESS” • • • • • UNIVERSE •All of the •Age = , and that exists anywhere Billion Years The “Big Bang” Theory •The theory that the present day universe began with a huge still and is . Evidence: 1. “Red shift” or . 2. Background microwave radiation •The left-over “bang”! Galaxy: •Huge body of and other matter in space. Drawing: Our sun is a star in one of the galaxy of the (spiral) STARS: •Usually large, self- bodies that produce their own . Nuclear Fusion of Hydrogen Star Classification: •Stars are classified by and (color). •See Reference Tables diagram p.15 •The sun is an average sized, average temperature star Solar System •The and everything that around it. Components: •Planets • • • •. •The estimated age of the Earth and solar system is Planets . Planets orbit the sun as the result of 2 forces… • . • . Drawing: Rocky (Terrestrial) Planets Gas Giant (Jovian) Planets • . • . • . • . • . • . Asteroids: •Solid and/or bodies that independently orbit the sun. •Range from 100 to 1000km in diameter. Asteroid belt- most asteroids are in orbits between Impact events form craters and are linked to and . and mass . Meteoroids: •Very solid fragments that orbit the sun. •“Shooting Stars”- meteors that burn up or vaporize Earths atmosphere. Comets: •Chunks of and methane with rock and metallic debris. •“Dirty Snowballs” •Orbit the sun in highly eccentric elliptical orbits. Tails (Drawing)
