David the astronaut

This seems to be anywhere from circa 1960 A.D. to circa 1965 A.D.

We were in space (outer space) on a space walk.

I had little to no knowledge of what we were doing.

At one point the conversation went to my asking about taking off the helmet.

When the helmet came off, it became impossible to breath, at least for me.

This brings up many options as to what can become of our universe. (in example, outer space doesn't need to remain as a vacuum)

And traveling through it needn't rely on conventional methods of thrust.