Presentation on theme: "Comets, Meteors, and Asteroids Oh My!!"— Presentation transcript:
1 Comets, Meteors, and Asteroids Oh My!! Terms:CometComaNucleusTailMeteorMeteoroidMeteoriteAsteroid
2 Describe the characteristics of comets, S6E1.fDescribe the characteristics of comets,asteroids, and meteors
3 In the distant parts of our solar system, comets are dust covered balls made of ice and rock These dust covered balls of ice and rock are called a nucleusSomething disturbs the comets and sends them streaking toward the sun!
4 As the nucleus passes the orbit of Jupiter, it begins to heat up. Some of the ice inside the nucleus turns to glowing gasThe gasses spread out from the nucleus to form an atmosphere around the nucleus called a comaTogether, the coma and the nucleus form the head of the comet
5 As the comet approaches the sun, energy from the sun blows parts of the coma away from the nucleus…..<Show Them>These parts stream away from the head of the comet to form a shimmering tailA comets tail ALWAYS points away from the sun
7 Some comets plunge into the sun, and others orbit around the sun one or more times The most famous returning comet is Halley’s Comet, which comes back approximately every 76 yearsCan you see where the nucleus, coma, and tail are?Judging from this picture, where is the sun?
8 AsteroidsAsteroids are chunks of rock and metal, much smaller than Earth’s moon
9 Asteroids orbit the sun like planets Most asteroids are found in a belt between the orbit of Mars and JupiterThe largest known asteroid is Ceres (940 km in diameter)Most asteroids are less than 1 km in diameter
10 Meteoroids, Meteors, and Meteorites Between 1,000 and 10,000 tons of space rock fall to Earth each day…… when it is in space these rocks are called meteoroidsMeteoroids are made ofrocky materials, and metal
11 When a meteoroid plunges into Earth’s atmosphere it is known as a meteor In Earth’s atmosphere, the meteor can get so hot that some or all of it burns up.The burning meteorappears as a streak of light ……A Shooting Star
12 When a meteoroid hits Earth’s surface it is known as a meteorite If a meteor does not completely burn up in our atmosphere, it will hit Earth’s surface.When a meteoroid hits Earth’s surface it is known as a meteoriteWorlds largest meteorite Hoba, found in Namibia
13 Draw the sequence that a meteoroid goes through……….
14 Quick Check In which direction does a comets tail always face? In the direction of the sunAway from the sunPerpendicular to the sunAll different directions
15 Quick Check What is a comets coma? The stony and icy center of the headA chunk of ironA stream of gas at its backThe atmosphere around its nucleus
16 Quick Check Where are most asteroids found? All over our solar system In orbit between Mars and JupiterNear EarthOutside of the solar system
17 Quick CheckWhat is the sequence that describes a space rock that falls to Earth’s surface?meteoroid, meteor, meteoriteMeteor, meteoroid, meteoriteMeteorite, meteor, meteoroidMeteor, meteorite, meteoroid