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According to his Twitter account, B.o.B. believes the world is flat. He's even offered his own version of scientific evidence as proof.

The Georgia native, who produced such hits as "Nothin' on You" and "Airplanes," continued his rant on Twitter with dozens of tweets supporting his theory. He even wrote and released a song called "Flatline," which discusses elements of his argument.

In response, astrophysicist Neil deGrasse Tyson fired back with scientific facts.

Despite his attempts to prove B.o.B. wrong, Tyson remained cordial, reminding the rapper, who also posted hours-long YouTube conspiracy videos, that his flawed thoughts didn't have to negatively impact his music career.