What is the difference between spacetime & space and time

Einstein proved that Space and time are elegantly connected. He labelled it, SPACETIME. How did he prove it?. He had one person travelling on a boat in one direction and another person standing still. Both people had watches on. Time actually moved slower for the person travelling in the boat than for the person standing still. This is also the case, should an astronaut leave earth and travel to another Galaxy, by the time he returned, he would have barely aged, but everyone he knew in his past life would have already died of old age.

Space-time system is everydays case for people now. It is what you see about you. You can change one dimention of them as well. It occure wnen you close the eyes or in car where space-speed system. I mean all 4 dimention at ones.So module of object change with time or with any other axis that you imagine in mind.

This is my uniontera's time.

Uniontera number 13, hope it helps. This is your so-called space.

Existence is the time expressed by light itself. http://www.youtube.com/watch?v=MjmOw1Pnc…

One has an "and" between the two words, the other does not.

Other than that, both terms connote the three spatial and one temporal dimension as one entity.