> Travelling around the Universe would take forever even at the speed of light. If we're talking about traveling within our galaxy; the distances and thus sub-

> Travelling around the Universe would take forever even at the speed of light. If we're talking about traveling within our galaxy; the distances and thus sub-light travel times involved are huge, however the time spans available are even huger. On the timescale of planets, a million years is not "forever" but actually a quite trivial amount of time - if there was an almost perfect clone of Earth on the other side of Milky Way where the evolution of multicellular life happened 1% faster than it did here, then they would be tens of millions of years ahead of us, and that is not only enough to reach us at speeds much lower than c but also enough to colonize the whole galaxy while doing so, spending multiple millenia at each planet before moving on.