Decades after crash landing on the paradise moon of Rocheworld, the members of Earth's first interstellar expedition refuse to leave their beloved home when a ship from the second expedition arrives to claim them. Original.
Robert Lull Forward, commonly known as Robert L. Forward, (August 15, 1932 - September 21, 2002) was an American physicist and science fiction writer. His fiction is noted for its scientific credibility, and uses many ideas developed during his work as an aerospace engineer.
Not as good as the first three, but still a good read. More character-oriented, and I'm more of a tech fan myself, but not so much so that I didn't enjoy it. A good conclusion to an epic story.