[mgsouth]

The U.S. government defines deep space as anything beyond low-earth orbit. [1] Others vary. [2] The U.S. "Deep Space Network" was created because communications with low-earth orbit and beyond-LEO had very different requirements [3].

[1] https://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim...

[2] https://en.wikipedia.org/wiki/Outer_space#Regions_near_the_E...

[3] https://en.wikipedia.org/wiki/NASA_Deep_Space_Network#Deep_s...