A Grammy nominated artist has taken to social media to express his theory that the world is flat. To help state his case, he uses the Hudson Valley to prove the world is not round.

Rapper Bobby Ray Simmons, Jr., better known as B.o.B., is convinced the world is flat. This week he has passionately defended his seemingly real belief that the world is flat.

It all seemed to start on Twitter with this tweet:

To further explain his picture and theory he then tweeted out:

The 6-time grammy nominated artist didn't stop.“A lot of people are turned off by the phrase ‘flat earth’ ... but there’s no way u can see all the evidence and not know... grow up" He tweeted.

He argued that if the Earth were curved, evidence of that would be seen when looking at the horizon in the distance and distant cities would be hidden from view because of curve. This is where the Hudson Valley came into play.

He also tweeted a number of pictures taken at high altitude. He believes these photos supports his claim, "no matter how high in elevation you are... the horizon is always eye level."

Another photo he tweeted to support his claim, a map made in 1892.

Others have tried to change B.o.B's opinion, even scientists have given the rapper scientific facts as to why the world is round. Despite all that Bobby Ray Simmons, Jr. is flat out with his opinion.