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Meter

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Intro to Astronomy

Definition

A meter is the fundamental unit of length in the International System of Units (SI). It is defined as the distance light travels in a vacuum in 1/299,792,458 seconds.

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5 Must Know Facts For Your Next Test

  1. The meter is crucial for measuring distances between celestial objects.
  2. Astronomers often convert meters to astronomical units or light-years for practicality.
  3. One meter equals approximately 39.37 inches.
  4. Meters are used to establish baselines for larger units like kilometers and parsecs.
  5. The definition of a meter was redefined in terms of the speed of light in 1983.

Review Questions

  • How is a meter defined in terms of the speed of light?
  • Why do astronomers need to convert meters to other units like astronomical units or light-years?
  • When was the current definition of a meter established?
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