The author of the passage most likely mentions “Little Green Men” in the first paragraph for what purpose?

A.To poke fun at the ignorance of most science fiction readers

B.To introduce a daunting challenge that will have to be addressed before human interstellar space travel can become possible

C.To draw a comparison between the attempts of humans to voyage in space and the more successful attempts of other civilizations

D.To draw an amusing distinction between a supposed danger of space travel, as presented in the popular media, and the actual challenges posed by interstellar space travel, as perceived by scienfists

E.To suggest that the concept of human interstellar space travel is as much of a myth as the “Little Green Men” that appears in science fiction movies and television programs