If you like to think about interstellar travel, one interesting option is that somebody (something?) could develop the ability to live independently of stars based on fusion. In this scenario you wouldn't have to move very fast, 10,000 years to get to the nearest star is about right, but you might lose all interest in dry inner solar system planets like the Earth (compared to something like Pluto which is closer to 50% water) before you get there.
If you could find lithium you could breed tritium and run a D + T fuel cycle, which creates a massive flux of neutrons (maybe need Pb or Be for multiplication) and will let you breed extra T that you can let decay to He3. D + He3 is a good candidate for a fuel for "fast" interstellar travel that might make the crossing in 50 years.
Alternately if you can make D + D work you can certainly live between the stars and you can still harvest some bred T and He3 for "mobile" applications.
If you could find lithium you could breed tritium and run a D + T fuel cycle, which creates a massive flux of neutrons (maybe need Pb or Be for multiplication) and will let you breed extra T that you can let decay to He3. D + He3 is a good candidate for a fuel for "fast" interstellar travel that might make the crossing in 50 years.
Alternately if you can make D + D work you can certainly live between the stars and you can still harvest some bred T and He3 for "mobile" applications.