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Term Definition

The degree of brightness of an object in the sky according to a scale on which the brightest star has a magnitude -1.4 and the faintest visible star has magnitude 6. Sometimes referred to as apparent magnitude. In this scale, each number is 2.5 times the brightness of the previous number. Thus a star with a magnitude of 1 is 100 times brighter than on with a visual magnitude of 6.


A measure of the total amount of matter contained within an object


Small particle of rock or dust that burns away in the Earth's atmosphere

Meteor shower is an event where a large number of meteors enter the Earth's atmosphere from the same direction in space at nearly the same time.

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