How did professor von braun know that millington was telling a sensational but untrue story to boost his book's sales?

Answer 1

Professor Von Braun knew he was lying because there is no life on the moon.

Answer 2

Professor von Braun likely realized that Millington was telling an untrue story to boost book sales because of inconsistencies in his story, lack of credible evidence, or contradictions in the information he presented. As an expert in the field, von Braun would have been able to identify red flags that indicated the story was fabricated.