[samsara15]

It's a lot more likely that population pressure or the environment will do us in within a few hundred or thousand years. The speed of light, the huge distances between stars, and the paucity of inhabitable planets rather limits what we can expect from space travel. Colonization of other worlds might not be an option. However, I wouldn't worry too much about the end of the universe or the Earth being swallowed by the Sun, those events are too far in the future.