Top Definition
noun. the part of the universe already visited by man or a man-made object.

from trek (after Star Trek and its ship USS Enterprise whose charter is 'to boldly go where no man has gone before') + sphere

Voyager 1 - already the most distant man-made object in space - is currently extending the treksphere by about one million miles every single day.
by blaiq March 07, 2009

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