When measuring distances on Earth, we use inches, feet, yards, meters, miles, kilometers, and so on. However, when we try to describe the… — When measuring distances on Earth, we use inches, feet, yards, meters, miles, kilometers, and so on. However, when we try to describe the placements of planetary or stellar bodies in space relative to Earth, it becomes impractical to use the same units. Instead, when speaking in terms of the cosmos…