The planet that can't be reached!

[Taz-in-Space]

Maybe somebody can tell me why a planet placed at location 0,0 cannot be reached by a player.

Is this a bug in the program? Perhaps a hardcoded check for a valid range?

I modded a map a while ago and placed planets in all four corners of the system map just to be different. I just now noticed that I can't go to the 0,0 square. No warning from the computer - it just stops short of the 0,0 point.