Back in the 17th century, science was divided on the subject of bird migration. Everybody knew that many species magically disappeared come winter, but nobody knew what happened to them. Scientists offered up a number of competing hypotheses; perhaps the most interesting being that of the British scientist, Charles Morton. In his view, they flew 180,000 miles to the moon, then returned each spring.
At the time, the general "scientific consensus" was that all planets were inhabited by some form of life, as God simply wouldn't go to the trouble of creating moons and other planets and then just leave them. That would be silly. Therefore, it only stood to reason that life would exist upon all of these orbs, and thus, when the birds left in autumn, they must fly to the closest orb - which would be our moon. There, they would fatten up amongst the trees, only to return to Earth in the spring to begin the important business of nesting and reproducing.
Of course, today we have a better understanding of migration, but that's only because of the heretics - who dared disagree with the "scientific consensus" of the time, and eventually determined what was actually occurring.
Whenever you hear that "the science is settled", or some talk about a "scientific consensus" - remember the birds.