This work seeks to investigate the emotional dimension of science denial through the case of the Flat Earth movement – a group of people who believe in a theory where the planet Earth is actually a flat disk, and the heliocentric model is a conspiracy orchestrated by scientific and governmental organizations – and the imbrications of this movement with American right-wing populism. By taking an affective approach inspired by the works of Sara Ahmed and Ty Solomon, the dissertation seeks to observe how the belief in conspiracies like Flat Earth has an emotional dimension to it, which crosses the same emotional paths as those of the affects that circulate around contemporary right-wing populism, especially the branch of it spearheaded by Donald Trump in the United States. Therefore, the work observes the interweaving between science denial and right-wing populism, and the discursive and emotional relations that these groups share, as to raise questions and discussions about the inherently political character of science, about the ways in which truth is manipulated in our current political spaces, and about how emotions are crucial to understand subjects adherence to any political movement or discourse.