I have to agree with Chris here. Though Farmer certainly kept up with the sciences (last I heard, anyway), he was anything but a hard sf writer. Nor would I call him traditional, in most senses of the term. He often used traditional materials, but frequently turned them on their heads (cf. Strange Relations, a collection of tales of alien encounters, which are actually explorations of Jungian and Freudian symbology and archetypes), and most often his work was exploration (through story) of the human need for and fertility in creating myths, whether of the classical (Greek and Roman) or pop cultural (Doc Savage, Tarzan, The Shadow, etc. -- the first two on which he did "biographies")....
He also had a love of atrocious puns which would rival Robert Bloch....