Final answer:
Distance can be measured in different units and can have different meanings depending on the context. Most distances traveled by humans are measured in miles or kilometers in everyday life. Distances can also vary depending on the frame of reference.
Step-by-step explanation:
In the given text, when it is mentioned that there is more to distance than just miles, it is referring to the fact that distance can be measured in different units and can have different meanings depending on the context.
For example, while a meter is the fundamental unit of length, most distances traveled by humans are measured in miles or kilometers because those units are more commonly used in everyday life.
In addition, distances can also vary depending on the frame of reference, as explained in the text with the example of measuring distances at relativistic speeds.