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If you're a flat-earther, this image is a fake |
In the 21st Century, the term "flat-earther" is used to describe someone who is spectacularly - and seemingly willfully - 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.