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Comets & Asteroids What they are Where they are They and us Copyright © 2011 InteractiveScienceLessons.com™ COMETS-WHAT THEY ARE A huge ball of mostly FROZEN ________ ________ WATER . Their size ranges between 1 and ____ ___ 200 miles wide. •There are ___________ in our solar system. TRILLIONS Copyright © 2011 InteractiveScienceLessons.com™ COMETS-WHERE THEY ARE OORT Most comets are found in the ______ Cloud, which is about ________ 75,000X further out than the earth is from the sun. A few orbit among the 8 __________ PLANETS . A _________________ ____ or GRAVITATIONAL TUG COLLISION ___________ is what sends some into the inner solar system among the planets. Copyright © 2011 InteractiveScienceLessons.com™ COMETS-THEY AND US A comet too close to the sun will begin to die as it sheds small fragments due to SOLAR _______ _____ WIND passing over it. TAIL forms. This is how the _____ If the Earth later passes through this, a METEOR phenomenon we call _________ _________ SHOWER occurs. There are ____ 14 major meteor showers that occur throughout the year. Copyright © 2011 InteractiveScienceLessons.com™ ASTEROIDS-WHAT THEY ARE IRON ROCK Asteroids are mostly _____ ______. Copyright © 2011 InteractiveScienceLessons.com™ ASTEROIDS-WHAT THEY ARE ORBIT the sun Most asteroids harmlessly _______ between _______ MARS and _________. JUPITER They will never gather into a planet because of Jupiter’s GRAVITY _________. A few have been nudged Copyright © 2011 InteractiveScienceLessons.com™ ASTEROIDS-THEY AND US There are 10,000,000 ___________ asteroids that cross earth’s orbiting route that are at least 10 meters across or larger. A ____________ FOOTBALL _______ FIELD sized asteroid collides with earth about every ______ 1,000 years. Asteroid ____ KT , some ____ 6 miles wide, is thought to be what caused the ____________ DINOSAUR extinction. Copyright © 2011 InteractiveScienceLessons.com™