An example of an analogy used to explain science:
"Consider the molecule of hydrochloric acid [sic, actually hydrogen chloride], one atom of hydrogen and one atom of chlorine. The hydrogen atom is lighter, and swings around the heavier, near-stationary chlorine atom like a discus in the hand of the spinning athlete. It is as if the athlete could spin only at certain speeds: no faster, no slower, and nothing intermediate."
Norwood Russell Hanson
Hanson, N. R. (1958). Patterns of Discovery: An inquiry into the conceptual foundations of science. Cambridge Univerity Press.
Read examples of scientific analogies
Many examples of science analogies are listed in 'Creative comparisons: Making science familiar through language. An illustrative catalogue of figurative comparisons and analogies for science concepts'. Free Download.