Neil deGrasse Tyson will have none of B.o.B.’s flat Earth theories.

The rapper launched a string of tweets Monday to his 2.3 million followers supporting a conspiracy theory that the Earth is actually flat — only to be spectacularly rebuked by America’s chief celebrity physicist.

“A lot of people are turned off by the phrase ‘flat earth,'” the rapper, famous for hit songs like “Magic,” “Nothin’ on You,” and “Airplanes,” B.o.B. wrote on Twitter Sunday. “But there’s no way [you] can see all the evidence and not know… grow up. You can regurgitate force fed information all day… still doesn’t change physics.”

After the singer’s tweets went viral, none other than Tyson came along to do exactly the kind of thing he should be doing: correcting celebrity misconceptions.

“Earth’s curve indeed blocks 150 (not 170) feet of Manhattan. But most buildings in midtown are way taller than that,” Tyson wrote to B.o.B. on Twitter. “Polaris is gone by 1.5 degrees south latitude. You’ve never been south of Earth’s equator, or if so, you’ve never looked up.”

Despite the debunking from Tyson, B.o.B. remained adamant about the Earth being flat. (He’s already tweeted two hour-long YouTube conspiracy videos — he’s in too deep now.) But thankfully Tyson reminded fans that an artist espousing outlandish theories doesn’t need to impact how we enjoy their work.