Rap star B.o.B became the subject of ridicule Monday (Jan. 25) after arguing that the Earth is flat on Twitter. During his zany diatribe, the rapper found himself in a back-and-forth with esteemed astrophysicist Neil deGrasse Tyson. In a surprising turn of events, Tyson has decided to clap back with a diss track aimed at B.o.B.

Don't expect to hear the astrophysicist's rhymes on this diss. Instead, he calls on his nephew, Stephen J. Tyson, Jr., who raps under the name "Tyson," to do the dirty work.

The elder Tyson took to his Twitter account to throw down the gauntlet, simply tweeting, "@bobatl As an astrophysicist I don’t rap, but i know people who do. This one has by back," with a link to the diss, titled "Flat to Fact," attached. Opting to pop off over Drake's infamous "Back to Back" instrumental aimed at Meek Mill, Tyson may not have the rapping resume of Bobby Ray, but sounds up to task to defend the family name.

"I'm bringing facts, took a bat at silly theory / Because B.oB. has got to know that the planet is a sphere, G," Tyson digs in with love taps before coming with heavier jabs, like "Very important that I clear this up / You say Neil's vest's is what he needs to loosen up / and he's amazing cause the brother's getting paid when the ignorance you're spitting's helping keep people enslaved," he rhymes.

The haymakers come in the form of lines tailored to Drake's original rhyme pattern on "Back to Back," even down to the Charlamagne tha God name-drop ("I've already stepped out of the fast lane / You the Donkey of the Day, I ain't waiting for Charlamagne / And all them strange clouds must be messing wit ya brain").

Tyson continues his onslaught by pegging B.o.B as everything but a cook, rapping, "Can't fool the people, Bob, they know what's up / I'm in the hating planetarium getting shoulder rubs / I think it's very clear that Bobby didn't read enough / And he's believing all of this conspiracy stuff."

But the kicker is the hook, which finds Tyson mocking B.o.B. "Bobby Ray's thinking that flat is fact... yeah, that flat is fact," he chants, before finishing him off with an equally witty second verse. Tyson may be known more for being in a classroom than a vocal booth, but his hip-hop roots are strong. He is a co-founder of Just Listen Entertainment, which was established to encourage kids and teens to explore "the hip-hop principles of peace, unity, love, and having fun through the expression of music, film, poetry, and youth workshops."

B.o.B is renowned as one of the dopest lyricists in the South, but this looks like a battle that he may not want any parts of from the sounds of this diss.

Listen to "Flat to Fact" below.

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