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"For two months, we were stuck on these preliminary results that were telling us that the compact disks had colder water, and the large disks had hotter water overall," remembered Banzatti.

The Milky Way is a typical 'disk' galaxy, which a shape similar to a pancake or compact disk, rotating about its centre and often containing spiral arms.

Instead of moving back and forth across under the camera, the disk moves in a spiral, akin to how a compact disk is played, which speeds up imaging.

Ottens was also involved in the development of the compact disk, and more than 200 billion of those have been sold worldwide to date.

Finally, iridescence can arise through diffraction, when light reflects off a more complicated periodic structure, such as the grooves in a compact disk.