“If the Earth is spherical, why are so many people scared?”
He went on to challenge Spanish science minister and former astronaut Pedro Duque to a debate about the Earth curvature.
Mr Poves said: “He will retreat and won’t confront me because he will end up losing.
“I can show he is an impostor, he earns a lot of money by telling lies.
“There is a cool reward for whoever gets a photo of space that isn’t CGI. I have never felt the earth move.
“I’m still waiting for you to show me: how does water curve?”
However, a spokesman for Spain’s Ministry of Science, Innovation and Universities told Newsweek Mr Duque would not debate whether the Earth is round.
He said: “In this case, questioning scientific evidence is simply ignorant.
“It can even become dangerous in matters of public health, such as those who question the safety of vaccines.”
The flat-Earth conspiracy has recently gained momentum as it gains supporters online.
Flat-earthers argue large bodies of water should sit level on Earth rather than curving to its shape.