"A giant waterworld that is wet to its core has been spotted in orbit around a dim but not too distant star, improving the odds that habitable planets may exist in our cosmic neighbourhood. The planet is nearly three times as large as Earth and made almost entirely of water, forming a global ocean more than 15,000km deep. Astronomers detected the alien world as it passed in front of its sun, a red dwarf star 40 light years away in a constellation called Ophiuchus, after the Greek for "snake holder"." - Graham Sergeant