Terms Antenna - A detector of radio waves. The electric field of the radio wave induces a voltage in the antenna which is amplified by a radio receiver. Asteroid - A small stony body a few meters to a few kilometers in diameter with orbits within the planetary system.
Some asteroids cross the earth's orbit leaving debris which become meteors.
Comet - A stony and icy body which orbits the sun in a long elliptical orbit. Comets usually leave a debris trail in their orbit which become meteors when the earth crosses their orbit. Constellation - A grouping of stars in the sky originally connected by lines by ancient people to suggest a shape. This adds to the maximum meteor velocity of 42 kilometers per second to give a maximum 72 kilometer per second fall rate on the earth. The E-Layer is part of the ionosphere.