The astronaut is clearly surprised by this question and he tries to buy time by saying that he did not understand the question.
Finally, he tries to evade the question whether he has seen UFOs or not by saying that he can see the stars, the moon, etc.
This interview makes clear that NASA has given clear instructions to the astronauts that they should not talk about UFOs.
This is dummy text. It is not meant to be read. Accordingly, it is difficult to figure out when to end it. But then, this is dummy text. It is not meant to be read. Period.