the profusion of meteors observed when the earth passes through a meteor swarm.
a transient rain of meteors, such as the Perseids, occurring at regular intervals and coming from a particular region in the sky. It is caused by the earth passing through a large number of meteoroids (a meteor swarm)
A brief period of heightened meteor activity, often occurring regularly in a particular part of the sky at a particular time of year. Meteor showers are generally named after the constellation in which they appear to originate; thus the Perseids appear to originate in the constellation Perseus and the Leonids in the constellation Leo. The showers occur when the Earth passes through a region having a greater than usual concentration of interplanetary debris, such as particles left by a disintegrating comet, at certain points in its orbit. Although the meteors enter the Earth’s atmosphere on parallel trajectories, perspective makes it appear as if they originate from the same point in the sky, known as the radiant.
- Meteor spectrography
noun the study of meteor phenomenon; also called [meteor spectroscopy] Usage Note science
- Meteor spectroscopy
noun See meteor spectrography
noun, Astronomy. 1. any large number of meteoroids moving in parallel paths.
[mee-ter] /ˈmi tər/ noun 1. the fundamental unit of length in the , equivalent to 39.37 U.S. inches, originally intended to be, and being very nearly, equal to one ten-millionth of the distance from the equator to the pole measured on a meridian: defined from 1889 to 1960 as the distance between two lines on […]