For years we've thought that the planet Neptune was a deep blue, but after a recent scientific study by the University of Oxford, it appears we've been living a lie. In fact, it turns out that Neptune is very close in colour to its planetary pal Uranus, in reality appearing as a powdery blue.
While NASA uses the best camera to capture these space spectacles (okay, you won't find the Hubble Space Telescope on our list, but who's quibbling?), the misconception arose from a series of visuals taken in the 20th century. These single-colour images were later recombined to create a balanced true-colour representation, but in the case of Neptune, the filtering was off, leading to the widespread misbelief of its deep blue hue.
