If you take away all the matter in space what is left. There would be no time and no mass, only light.

Just because you get ride of all mass there would still be time as time has nothing to do with mass. I fail to see the meaning behind this hypothetical situation.

Light does not experience time

Maybe if our universe fell back into the ( Big Crunch ) to recycle into a new big bang.

is where it is now,and the mass that makes up space will not really be able to be replaced, you must get all the original space back for it to fully be space no matter how far in time and lives journey you get if you want it to still be space that far in life i mean!>>

Light does not experience time

 

What about other reference frames?

If you take away all the matter in space what is left. There would be no time and no mass, only light.

 

There would be light. And the "quantum foam" from the zero-point fluctuations.

If you take away all the matter in space what is left. There would be no time and no mass, only light.

 

 

I've thought about this before, and I wondered if 3D space would even exist without mass.

What about "dark matter"? and "dark energy"? Most of the mass in the universe if dark matter; although we don't know what that is. I'm not sure we can call it "matter" at this point. And we know even less about dark energy.