As per our current science, we're forever limited to our galactic local group. Exponential growth tends to consume even very big things surprisingly quickly. I

As per our current science, we're forever limited to our galactic local group. Exponential growth tends to consume even very big things surprisingly quickly. I also question whether a mass die off event on this planet won't lock us out from ever rebuilding a spacefaring civilization. We've already used up all the readily accessible fossil fuel that was necessary for us to get this far.