Work commissioned by the UNAM Philharmonic Orchestra, 2016.

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In 1610, Galileo was experimenting with his brand-new telescope. The novel artifact had been used for spying and navigation, but no one had pointed it at the sky. Then, focusing his lens on Jupiter, he discovered four aligned little dots. At first, he believed they were stars, until he noticed that their daily location moved in the opposite direction. This anomaly increased his interest, as in addition to changing position among themselves, they followed Jupiter's transit through the zodiac. He finally concluded that they were not stars but moons orbiting the planet, now known as: Io, Europa, Ganymede, and Callisto.

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Io's close orbit causes strong gravitational tides that heat its interior, causing the greatest tectonic activity in the solar system. Europa is covered by a thick layer of ice, which, tortured by Jupiter's gravity, cracks, propelling geysers emanating from the deep inner ocean. Ganymede, the largest of all, possesses its own magnetic field, evidence of the molten iron that rotates in its core. Callisto, which rotates once for each orbit, shows the same face to the planet and has its back full of craters from countless bodies attracted by the planetary giant.

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Io, Europa, and Ganymede rotate in orbital resonance: for every turn of the first, the second makes two and the third makes four. This relationship can be translated into music as intervals, harmonics, and rhythms. The basic materials were obtained from the orbital periods, while the character of the themes was inspired by Io's active volcanism, Europa's icy geysers, Ganymede's liquid core, and Callisto's impacted surface.