Anne McCaffrey is known as the Dragonlady of Science Fiction. Her most famous works are the Pern series. The first trilogy was published in the 1970s as a pure fantasy series. By the ninth novel, Dragonsdawn, published in 1989, the series took a turn into science fiction as the novel explores the forgotten origins of Pern as a colony of Earth. I've listed the novels in chronological (not publication) order. Note, I don't recommend the novels she wrote with her son or the later novels her son and daughter have written to continue the series.
This was one of the series I followed religously as a teenager. I loved the strong characters and well developed world building.
This is now a series streaming on Amazon! The first 10 books in the series were written by Robert Jordan. As his health failed, Jordan made plans to allow someone else to finish his epic series after his death. His editor (and wife) picked Brandon Sanderson as the writer to finish the series. What was expected to be 1 final book turned into 3.