sci. 5-2 artificial satellites pages 132- 135. a. artificial satellites- any human-made object...
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Sci. 5-2 Artificial Satellites Pages 132-135
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A. Artificial Satellites- any human-made object placed in orbit around a body in space, such as Earth.
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B. The Soviet Union launched the first Earth-orbiting satellite in 1957.
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1) Sputnik 1- carried instruments to measure the properties of Earth’s upper atmosphere
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2) Sputnik 2- carried a dog named Laika
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C. The first United States satellite went up in 1958.
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1) Explorer 1- carried scientific instruments to measure cosmic rays and small dust particles.
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a) discovered the Van Allen radiation belts around Earth.
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2) Tiros 1- weather satellite
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3) Echo 1- 1st communications satellite
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D. Low Earth Orbit (LEO’s) are located a few hundred kilometers above the Earth’s surface. ( Still in Earth’s atmosphere)
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E. Satellites in geosynchronous orbits (GEO’s) have an orbit period of 24 hrs and remain over one spot.
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1) This allows ground stations to be in continuous contact with these satellites so your TV program or phone call is not interrupted.
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F. Using satellites, scientists have been able to obtain information by remote-sensing – gathering images and data from high above the Earth’s surface.
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G. Satellite programs are used for weather observations, communications, mapping the Earth, tracking ocean currents, crop growth and urban development.
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H. Military Satellites are used to spy on other countries to see their military strength and to serve as early warning systems against missiles launched toward the USA.