Rapper B.o.B, who has come under fire in recent months for his contentious pseudo-scientific claims, started a crowdfunding campaign to in an apparent attempt to fact-check his own “flat Earth” theory. With a goal of $100 million, the “Airplanes” artist said he hopes to verify the Earth’s curve by launching “one, if not multiple, satellites into space.”

According to the GoFundMe page, which was launched last week and had raised less than $2,000 by Tuesday, originally started with a pledge of $1,000 from the rapper himself. Soliciting fans for donations to help B.o.B “find the curve,” the rapper promises to keep fans updates “with step-by-step documentation of the process.”

“I’m starting this GoFundMe because I would like to send one, if not multiple, satellites as far into Space as I can — or into orbit as I can — to find the curve,” he said in a video posted to GoFundMe. “I’m really… I’m looking for the curve.”

Whether or not the rapper is earnest in his apparent suspicion that Earth is a disc rather than a sphere is not clear, but the rapper has come under fire for the suggestion from famed astrophysicist Neil deGrasse Tyson. The scientist last year blasted B.o.B for a “flat Earth” tweet shared in January.

“The cities in the background are approx. 16miles apart... where is the curve?” he tweeted. “Please explain this.”

“Earth's curve indeed blocks 150 (not 170) ft of Manhattan. But most buildings in midtown are waaay taller than that,” Tyson replied. “Being five centuries regressed in your reasoning doesn’t mean we all can’t still like your music.”

B.o.B later responded later dropped a diss track in response to the exchange and titled it “Flatline.”