Eventually into nothingness if "The Big Rip" theory turns out to be true. According to it, the Universe will continue to expand until it reaches a point where matter can no longer hold together and it becomes a cold dark void with no more stars and planets.Inflating into what?
There are definitely other planes of existence in the Star Trek Universe, but otherwise, I think it's considered the same size--roughly that our Galaxy is just one of many billions in a greater whole.Is the Star Trek universe bigger than the real universe?
Do it. It's fun. Just be mindful of the ant...That zooming in thing was spooky BTW. Like being dropped out of a plane into the ocean. I was too scared to go all the way down to the smallest thing.