The ocean hidden under the icy shell of Saturn's moon Enceladus harbours complex organic molecules, a study said Wednesday, offering further evidence that the small world could have all the right ingredients to host extraterrestrial life.

Just 500 kilometres (310 miles) wide and invisible to the naked eye, the white, scar-covered Enceladus is one of hundreds of moons orbiting the sixth planet from the Sun.

For a long time, scientists believed Enceladus was too far away from the Sun -- and therefore too cold -- to be habitable.

Then the Cassini space probe flew past the moon several times during a 2004-2017 trip to Saturn and its rings, discovering evidence that a vast saltwater ocean is concealed under the moon's kilometres-thick layer of ice.

Since then, scientists have been sifting t

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