Once we leave the galaxy we will still be in space but it will be empty but not completely empty you would be surrounded by other galaxy's though they will be far, if we are able to advance technology enough we will be able to go throughout the universe.
Answer:
Three dimensional
Explanation:
the 3 dimensions of an object are Height, Width and Depth.
the prime meridian is 0* longitute and the equator is 0* latitude.
