Description #2489207

• The elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object

The elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object, 4 letters, 1st letter O
The elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object, 4 letters, 2nd letter W
The elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object, 4 letters, 3rd letter L
The elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object, 4 letters, 4th letter T

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