alien trade relations
if aliens from another galaxy
wants to buy a planet in the milky way galaxy
then those aliens could trade one of the planets in their galaxy
for a planet in the milky way galaxy
and/or if aliens from another galaxy
wants to buy land of a planet in the milky way galaxy
then those aliens could trade land of one of the planets in their galaxy
for land of a planet in the milky way galaxy
it's unlikely that two planets have the same value
so a valuation is probably necessary
for a satisfactory deal
example:
many low value planets traded for one medium value planet
or moon, planetoid, asteroid, space station and so on
depending on how poor those aliens are
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