Dark is the Sun by Philip José Farmer

Deyv said, “This is all very well, but how does it concern me? I won’t live nearly as long as a tharakorm , and these gateways terrify me. They are not guaranteed entrances to places where the Earth won’t die—for an unimaginably long time yet. Anyway, what is life to me without my own soul egg and my tribe, the people I know and love?....No, I’m not going one step further on this crazy quest of…