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Asenath Cha

on 6 June 2013

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Transcript of Satellites

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli By: Asenath and Raghavy SATELLITES How do satellites work? Important Satellites The Six Basic Satellites -in order for it to stay in orbit it must move at the right speed
-satellites must be about 150 km above Earth's surface to stay in orbit Natural and Artificial Satellites -the moon is a natural satellite of Earth
-artificial satellites are sent into space by people
-are about hundred artificial satellites orbiting earth
-sputnik 1 was the first artificial satellite -receives radio signals from Earth
-signals are bounced off satellites
-communicate by antenna
-signals go to the Earth Station
-Earth Station sends radio signals
-signals to space are called "uplinks"
-signals back to Earth are called "downlinks" Sputnik 1 -first satellite to orbit the Earth
-was launched by the Russians on October 4, 1957
-under two feet across
-only used for radio transmitter
-orbited Earth once every 96 minutes Sputnik 2 -second satellite
-held a dog named Laika
-first animal to soar in space Explorer 1 -launched January 31, 1958
-first U.S earth satellite
-sent up to space as part of the U.S program for the International Geophysical Year (1957-1958) Vanguard 1 -launched March 17, 1958
- fourth artificial Earth orbital satellite launched
-first satellite to be solar powered
-oldest man-made satellite still in orbit Echo 1 -launched August 1960
-giant metallic balloon 30 meters across
-first communication satellite
-first inflatable satellite
-reflected radio signals back to Earth Tiros 1 -launched April 1960
-first weather satellite
-sent pictures of clouds to Earth Transit 1B -first orbited April 1960
-navigation satellite
-launched by U.S Navy Satellite -to stay in touch with other things or people all around the world by television, telephone, radio broadcast and other Resource Satellite Weather Satellite Navigation Satellite Military Satellite Communication -help scientists' monitor natural resources and the environment also to keep track of ocean life and more -carry cameras to take photos of Earth's atmosphere so scientist can study the clouds -help sailors or pilots to navigate and/or find their way -used for gathering information about other governments, navigation and communication Scientific Satellites -study conditions in space Orbiting Satellites Works Cited Speeds of Orbiting inertia-tendency- continue
moving or remain at rest

friction forces- to slow down when it moves through Earth's atmosphere

orbital velocity- speed that satellite must maintain in order to stay in orbit

escape velocity-speed required to breakfree from Earth's gravity More About Satellites -telescope are also launched with satellites
-space junk may cause damage to satellites
-the Canadarm is used to move satellites
-takes about 20 minutes to launch a satellite into space
-by 1965 more than 100 satellites were being placed in orbit each year
-by the early 2000's more than 40 countries were being placed in orbit each year Books Barnett,Alex.Space.New York:Dorling Kindersley Pub,2004.Print. Explore the Solar System.Chicago:World Book,2011.Print. Green,Dan and Basher,Simon.Astronomy.New York: Kingfisher,2009.Print. Holland,Simon.Space.New York:Dorling Kindersley Pub,2004.Print. Ganeri,Anita.Earth andSpace.Bath:Parragon,2008.Print. Lippincott,Kriston.Space.London.New York:DK Pub,2009.Print. Osborne, Will and Osborne,Mary P.Space.New York:Scholastic Inc,2002.Print. Shuter,Jane.Space and Technology.Oxford:Heinemann Library,1999.Print. The World Book encyclopedia.Chicago:World Book Inc.2011.Print.(vol.17) Walker,Niki.Satellites and Space Probes.New York:Crabtree Pub.Co,1998.Print. Zappa,Mancia.Rockets and Satellites.Edina,Minn:ABDO ,2011.Print. Work Cited Websites "Satellite dish." Compton's by Britannica. Encyclopædia Britannica Online School Edition.
Encyclopædia Britannica, Inc., 2013. Web. 15 May 2013.
<http://school.eb.com/comptons/article-9335747>. Kelch, Joseph. "Satellites, Artificial." The New Book of Knowledge. Grolier Online, 2013. Web. 23 May 2013. Waters, Tom. "Space Satellites." The New Book of Popular Science. Grolier Online, 2013. Web. 17 May 2013. Thank You For Watching! :) The Different types of Orbits Polar Orbit- when a satellite travels from pole to pole
Elliptical Orbit- takes satellite far from earth one end and close the other
Geosynchronous Orbit- when satellite orbits the same speed of Earth's rotation More About Satellites (continued) -nearly 3000 satellites in orbit
-first 24yrs. of space, satellites were launched on rockets
-rockets generally carried single payload into space
-then rockets are discarded and they burn up Did you know? Radio broadcasts, television programs and telephone calls are transmitted by communication satellitesAlso, communication satellites are able to transmit television signals to receiving dishes at homes, making it possible for people to watch events from all over the world? Random Fact... Broadcast signals are used to indicate a satellites position in space
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