A river is a river, independent of whether there are other rivers nearby. In science, we call things what they are based on their attributes, not what they're next to.
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About Alan Stern
Alan Stern was a contemporary American engineer and planetary scientist. Sol Alan Stern is an American engineer, planetary scientist and private astronaut. He is the principal investigator of the New Horizons mission to Pluto and the Chief Scientist at Moon Express. Read more on Wikipedia →