I think space does go on forever , some things do.. Take my wife for example .
Also the whole idea of the space time malarky fascinates me . There is a thing called the twins paradox which I find perplexing
Twins are split up and travel in space ships.The twins are each equipped with a clock and powerful telescopes so they can view each other's time. For the sake of interest, an obliging alien has placed a clock on the star synchronised to Earth time, which can be viewed both by Ann from Earth, and Bob during his space flight.
The theory proposes that the twins age at different times. There are lots of explanations on the net they are well worth a look if you feel that your mind needs stretching, this link is excellent
Relativity Example - More Detail