80s Films: cher's got him, babe, and he's got a face?

Questions

robert heinlein: paradoxical term for his stories about a probable course of events?

robert heinlein: space vehicle named after famous italian scientist?

robert heinlein: character who conquered old age in time enough for love?

robert heinlein: editor of astounding sf to whom heinlein made his first sale?

robert heinlein: rah never owned a farm, but often used this pen name?