In astronomy, light units are a convenient way to measure distances. Light travels at a speed of
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In astronomy, light units are a convenient way to measure distances. Light travels at a speed of approximately 3 × 10 8 m/s which means that one light second is approximately 3 × 10 8 m. Below we list seven distances in light-units and nine physical sizes. Match each distance to one size. light nanosecond light millenium light second light century light hour light minute light-year across a medium-sized country across a child's limb between the Earth and the Moon between planets in the outer solar system across the known Universe between planets in the inner solar system reach of human-made radio signals out into the Universe across a small galaxy between stars in the center of our galaxy.
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