Final answer:
Light's speed (c) is the most common measurement for large distances in space due to its constant velocity in all frames of reference.
Explanation:
The speed of light is the quantity most commonly used to measure large distances in space. Light travels at a constant speed denoted by c, which is approximately 3.00 x 10^8 meters per second.
Unlike sound or air, light can propagate through a vacuum such as outer space, making it a reliable measure for large distances in the universe.
This property of light's speed being constant in all frames of reference is a fundamental concept in physics and plays a crucial role in understanding the vast distances in space.
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