| By Brendan O'Neill |
In the 21st Century, the term "flat-earther" is used to describe someone who is spectacularly - and seemingly wilfully - ignorant. But there is a group of people who claim they believe the planet really is flat. Are they really out there or is it all an elaborate prank?
Nasa is celebrating its 50th birthday with much fanfare and pictures of past glories. But in half a century of extraordinary images of space, one stands out.
 | WORLD VIEW 330 BC Aristotle provides evidence of spherical earth 240 BC Eratosthenes of Cyrene accurately calculates circumference of globe 8th Century AD work by Bede shows acceptance of sphere idea |
On 24 December 1968, the crew of the Apollo 8 mission took a photo now known as Earthrise. To many, this beautiful blue sphere viewed from the moon's orbit is a perfect visual summary of why it is right to strive to go into space.
Not to everybody though. There are people who say they think this image is fake - part of a worldwide conspiracy by space agencies, governments and scientists.
Welcome to the world of the flat-earther.
Our attitude towards those who once upon a time believed in the flatness of the earth is apparent in a new Microsoft advert.
 Photos such as this one are deemed fakes by flat-earthers |
Depicting an olden-days ship sailing on rough seas, presumably heading towards the "edge of the world", the advert is part of a $300m campaign aimed at rescuing the reputation of Windows Vista by comparing its critics to flat-earthers.
Satellite era
But are there any genuine flat-earthers left? Surely in our era of space exploration - where satellites take photos of our blue and clearly globular planet from space, and robots send back info about soil and water from Mars - no one can seriously still believe that the Earth is flat?
|   Circumnavigation is a case of travelling in a very broad circle across the surface of the Earth  James McIntyre Flat-earther |
Wrong.
Flat earth theory is still around. On the internet and in small meeting rooms in Britain and the US, flat earth believers get together to challenge the "conspiracy" that the Earth is round.
"People are definitely prejudiced against flat-earthers," says John Davis, a flat earth theorist based in Tennessee, reacting to the new Microsoft commercial.
"Many use the term 'flat-earther' as a term of abuse, and with connotations that imply blind faith, ignorance or even anti-intellectualism."
Mr Davis, a 25-year-old computer scientist originally from Canada, first became interested in flat earth theory after "coming across some literature from the Flat Earth Society a few years ago".
"I came to realise how much we take at face value," he says. "We humans seem to be pleased with just accepting what we are told, no matter how much it goes against our senses."
Mr Davis now believes "the Earth is flat and horizontally infinite - it stretches horizontally forever".
"And it is at least 9,000 kilometres deep", he adds.
James McIntyre, a British-based moderator of a Flat Earth Society discussion website, has a slightly different take. "The Earth is, more or less, a disc," he states. "Obviously it isn't perfectly flat thanks to geological phenomena like hills and valleys. It is around 24,900 miles in diameter."
Mr McIntyre, who describes himself as having been "raised a globularist in the British state school system", says the reactions of his friends and family to his new beliefs vary from "sheer incredulity to the conviction that it's all just an elaborate joke".
So how many flat-earthers are around today? Neither Mr Davis nor Mr McIntyre can say.
BY-BBC NEWS
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