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LIKE a hapless cartoon character, Saturn has its own personal “rain cloud” that follows it around. Water vapour spewing from its moon Enceladus appears to drizzle onto the giant planet from space.
When water was discovered in Saturn’s cloud tops in 1997, the source was a mystery. It is too cold there for water to linger – it should condense and rain down to lower altitudes.
But now Europe’s Herschel space observatory has an answer: space rain. It spotted the infrared signature of water vapour in a vast ring around the planet (…
