I’ve seen megameters used in the context of astronomical distances, but not terrestrial ones. I think terrestrially, the familiarity of kilometers helps with a sense of scale.
True, but not everyone has that in the forefront of their mind at all times. Just like using millions of dollars and billions of dollars in the same sentence can distract people from the scale, the same is true for SI prefixes in non-technical settings. Like, say, negotiations over buying a used car.
I’ve seen megameters used in the context of astronomical distances, but not terrestrial ones. I think terrestrially, the familiarity of kilometers helps with a sense of scale.
The beauty of the metric system is you don’t lose a sense of scale from using a higher unit because you can intuitively know 1Mm is 1000km.
True, but not everyone has that in the forefront of their mind at all times. Just like using millions of dollars and billions of dollars in the same sentence can distract people from the scale, the same is true for SI prefixes in non-technical settings. Like, say, negotiations over buying a used car.