And here it is.
The seventh planet from the Sun is the rather-unfortunately named Uranus. Some pronounce it You're-ranus. Others say Oor-anus, which is technically correct, but schoolboys (or those with a schoolboy sense of humour) delight in the question, "Can you see Uranus through a telescope?"
The answer, oddly enough, is yes - it is the blue dot above, taken through my telescope in the back garden the other night. Indeed, on a good night you can see it with the naked eye, though it was not identified as anything other than a star until 1781, when William Herschel first claimed it as a comet.
There is something awe-inspiring about knowing that this blue dot is orbiting the Sun at an average distance of 1,790,000,000 miles and takes 84 years to go once round its orbit.
There's a good close-up picture of Uranus here. Uranus has a thick atmosphere and a small rocky and icy interior. Oddly enough, it rotates sideways on to the Sun, like a ball going round a roulette wheel. It has a system of rings, visible in the fly-by photos of Voyager 2, and 27 known moons.
If you want to see another awe-inspiring pale blue dot, try this one, which is the Earth seen from beyond Uranus, taken by Voyager 1.
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