"One of the most fascinating aspects of Enceladus is that it's so very small as icy moons go, but so very geophysically active, " said Dr Bob Brown, from the University of Arizona, US, and team leader for Cassini's visual and infrared mapping spectrometer.

BBC: NEWS | Science/Nature | Saturn moon delights and baffles

It consists of a telescope, an infrared (IR) spectrometer, and a multi-spectral CCD camera.

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It uses a small spectrometer to bounce infrared light off particles in the sample.

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Hubble's historic view is actually a combination of two separate images taken by Hubble's Advanced Camera for Surveys (ACS) and its Near Infrared Camera and Multi-object Spectrometer (Nicmos).

BBC: NEWS | Science/Nature | Hubble sees the faintest galaxies