Aristotle believed that something called the "visual flux" flowed out of eye, bounced off objects, and then returned to the eye, and that this was the basis of eyesight. how did he explain the fact that it gets dark outside at night? a, the sun is not in the s ky. b. the eye puts out less visual flux at night. c. fewer people are active at night so there is less visual flux about. d. night air is opaque because nights are cooler.