The 'Guinness Book of (Universe) Records': Meet the planets which are the hottest, coldest, oldest, youngest and fastest | Mail Online: "Over the last 50 years, as our telescopes have got bigger and better, we have started to learn a little bit about our cosmic neighbours.
And astronomers have found a huge array of planets out there, with some startling characteristics, certainly worthy of a mention in an intergalactic version of the Guinness Book of Records.
For instance there's the fastest planet - SWEEPS-10 - which flies around its sun at a distance of just 740,000 miles - about three times the moon's distance from Earth - meaning a year lasts just 10 hours."
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