Why People Believe the Earth Is Flat
The community
The flat earth movement is not new: flat earth societies existed in the nineteenth century. The contemporary version is different in scale and character, driven largely by YouTube videos and online communities that have connected isolated believers into a global network.
The movement holds, at a minimum, that the Earth is a flat disc rather than a sphere, and that governments, space agencies and much of the scientific establishment are engaged in a coordinated deception to conceal this.
The evidence typically cited includes the apparent flatness of water, the visibility of objects across distances that spherical geometry would seem to preclude, and the claim that NASA photographs of Earth are composites.
What the evidence shows
Every photograph of Earth from space, from multiple independent space agencies including those of countries that do not cooperate politically, shows a spherical planet. Ships disappear hull-first over the horizon, consistent with a curved surface. The different star constellations visible from the northern and southern hemispheres are explained by a spherical Earth and have no flat-earth explanation. Lunar eclipses show a circular shadow on the Moon, which a flat disc could not consistently produce.
Communications satellite positioning systems, which underpin GPS, mobile phone networks and global shipping, function as designed only on a spherical Earth model. They would not work if the Earth were flat.
Why the belief persists
Research on conspiratorial thinking consistently finds that belief in specific conspiracy theories is associated with a broader disposition toward distrust of authority, not with the specific merits of each claim. People who believe the Earth is flat almost always hold other conspiracy beliefs.
The psychological function of conspiracy belief is not primarily epistemic. It provides a narrative that makes the believer special, privy to information that most people cannot see, and part of a community of others who know the truth. These are genuine psychological needs that evidence alone rarely addresses.
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