CLOUDY ATMOSPHEREFIND OUT MOREVenus is only a little smaller than Earth, is made up of rock, and has an atmosphere, but it is otherwise quite unlike our planet. Its surface is covered with…
Satellites—a Far-Out LookWeatherRadar and SatellitesRadar—Scanning the SkiesDoppler—the New GenerationSatellites—a Far-Out LookThe Modern EraPutting It All Together If a picture is worth a thousand…
HOW SATELLITES WORKSATELLITE COMMUNICATIONSORBITSFIND OUT MOREAn object that circles another in space is called its satellite. Earth has one natural satellite, the Moon, but a swarm of…
Recent Discoveries: Earth Drags Space and Time Einstein's theory of relativity predicts that large rotating objects should drag space and time around themselves as they turn. The…
(Encyclopedia) short waves, radio waves whose frequencies range from about 3 to 25 megahertz (Mhz), corresponding roughly to the high-frequency band (see radio frequency). When they impinge on…
by Mark Hughes
Our solar system consists of a bright yellow star, eight planets, nearly 150 moons, and thousands of smaller objects like asteroids and comets. If you wanted to see all eight planets…
(Encyclopedia) uniformitarianism, in geology, doctrine holding that changes in the earth's surface that occurred in past geologic time are referable to the same causes as changes now being produced…
(Encyclopedia)
CE5
Apsis points, or apsides, in the earth's orbit: At perihelion the earth is closest to the sun and at aphelion it is farthest from the sun.
apsis (pl. apsides), point in the…
(Encyclopedia)
CE5
Van Allen radiation belts: The solar wind, a stream of protons, electrons, and ions coming from the sun, gives the belts their asymmetrical shape.
Van Allen radiation belts,…
Subjects Geography History Language Arts Mathematics Science Social Studies
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Reference Sources Almanac…
