Kilometers or kilometers, it doesn't matter.
These familiar units were all set up for the convenience of uniformity by humans.
In other words, as long as humans want, a meter can be one meter, or it can be two meters or half a meter, etc.
The difference lies in how humans have agreed on the definition.
But what about the mysterious perfect sphere on the Moon?
The radius is exactly one thousand meters!
Is this really just a coincidence?
If it is, that's good.
If not, it gives one a tingling sensation on the scalp.
The former indicates that alien civilizations have visited the Moon before, and possibly even before the birth of human civilization.
If it is the latter, then humanity is in huge trouble.
The latter implies that the civilization that created the sphere has been monitoring human civilization for a long time.
Perhaps the alien civilization's space fleet is already on its way to the Solar System.
