Rapper B.o.B and famed astrophysicist Neil Degrasse Tyson are feuding online over the shape of the Earth.
It all started a few days ago when B.o.B sent out a series of tweets and photos insisting that the earth is flat suggesting there was some sort of government conspiracy denying this.
Tyson tweeted back, trying to explain to the rapper that centuries of scientific evidence confirm that our planet is round.
But B.o.B apparently wanted none of it, releasing a song, known in the rap world as a "diss track," called "Flatline" taking aim at Tyson.
For his part, the astrophysicist suggests that while he's a fan of B.o.B’s music, he doesn't care for the rapper's science.
Not to be up-staged, Tyson then tweeted out some music as well titled ‘Flat To Fact, B.O.B Diss Track.”