The primary source of the Astronef's propulsion is the **R. Force**, which is a repulsive force that counteracts or overcomes the attractive force of planets, based on Professor Rennick's discovery of gravitation's two separate forces: attractive and repulsive<sup class='text_citation' source_id='1' start_phrase='Three out of the five sets of engines in the Astronef develop the R. Force' end_phrase='gravitation asserts itself.'></sup>. The Astronef is directed solely by this repulsive force for space travel<sup class='text_citation' source_id='1' start_phrase='She was directed solely by the repulsive force' end_phrase='balanced by the moon.'></sup>.

What is the primary source of the Astronef's propulsion?

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