Multiple choice

__________ is the astronomical measure of the distance.

  1. Great circle

  2. Small circle

  3. Knot

  4. Light year

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A light year is the astronomical measure of distance - the distance light travels in one vacuum year (about 9.46 trillion km). Great circle and small circle are navigation terms for circles on spheres. Knot is a unit of speed used in maritime and aviation contexts (1 nautical mile per hour).

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