[davisfh]

Sounds like Orphans of the Sky by Robert Heinlein. ("Universe", "Common Sense".)"

I really don't recall. I was quite young when I read it - maybe late teens or early twenties - and this youngster is now seventy-four. That would be fifty-odd years ago. You think Heinlein's novel would be that old?

[danielmryan]

The two-fer was first published in 1963, and the first half - "Universe" - was published as a dime novel in 1951.

This Wikipedia summary may jog your memory. You may be surprised to see when the two parts were originally written.

[mrreaganaut]

You think Heinlein's novel would be that old?

Definitely! It must be Orphans of the Sky. Heinlein lived from 1907 to 1988, and invented most of the cliches Hollywood uses today (Asimov invented the rest.)