Andrew wrote:

Just a simple question that I'd like to know. Why is it now in every Ranma 1/2
fanfic, or in any fanfic, someone is being punched into Leo? Why not Vega or the
Southern Cross? How about Ursa Major?

You misread.  Mostly, they're entering L.E.O. - Low Earth Orbit.

  okay...let's all stop replying.  it's been answered god knows how many
times