An example of an analogy used in popular science writing:
"It was long known that this virus [tobacco-mosaic virus], having the shape of long sticks…, is formed by a bunch of long straight molecules of organizing [sic] material (known as ribonucleic acid) with long protein molecules would around it like a coil of electric wire around the iron core in an electromagnet."
George Gamow (1961) One, Two, Three…Infinity. Facts and speculations of science, Revised Edition, Dover Publications, Inc., New York.
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.