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lesson5.notebook October 09, 2013 Review: sun spots and solar flares inner and outer planets what makes a planet Pluto the dwarf planet May 2610:20 AM May 2610:40 AM 1 lesson5.notebook October 09, 2013 Comets dirty snowballs composed of ice, rock and gas originate from the Kuiper Belt (small bodies orbiting the sun beyond Neptune)and Oort Cloud (cloud of icy debris at the furthest reaches of suns gravity in our solar system) They travel in long elliptical orbits around the sun and are affected by the gravitational pulls of other planets It has a long dust tail as sunlight starts to melt the ice, these can stretch millions of km Most famous is Halley's Comet which is visible every 76 years or so May 2610:24 AM Periodicity of Comets: "Period" is the amount of time it takes an object in orbit to return to its starting location. Comets travel in short and long periods around the sun in elliptical orbits May 2610:27 AM 2 lesson5.notebook October 09, 2013 The Elliptical orbit of Halley’s Comet May 2610:28 AM Asteroids Small bodies believed to be the leftover remains of the formation of the Solar System Mostly found in an asteroid belt between Mars and Jupiter They have irregular shapes Range in size from a grain of sand up to 1000km An asteroid up to 1 km would devastate Earth May 2610:30 AM 3 lesson5.notebook October 09, 2013 May 2610:31 AM Meteors Meteoroid a rocky chunk, broken off an asteroid or planet, which floats through space Meteora meteoroid that burns up as it passes through Earths atmosphere, seen as a shooting star Meteoritea meteoroid that does not burn up fully in the Earths atmosphere and hitsthe Earths surface May 2610:31 AM 4 lesson5.notebook October 09, 2013 Deep Impact Sites A place where a relatively small object (meteorite) has collided with a larger object (planet) Produces a fairly circular depression in the surface of the larger object referred to as an impact crater May 2610:33 AM Readings: Pages 398 407 Questions: Page 411: #'s 4,5,6,7,8 Asteroid Video: May 2610:35 AM 5