What quantity does “five light-years” describe?
Answer & explanation
The distance light travels in five years.
Distance equals speed times time. The defining year is multiplied by the speed of light. An object can be several light-years away without being that many years old.
Cosmos
Chapter 1 · The Shores of the Cosmic Ocean
AI reviewed · sources pending · version 9
Generally accurate according to an AI review. Sources and this book association have not been verified.