The discovery of the moons of Jupiter lent support to the heliocentric system, which states that the Sun is the center of the solar system and the planets revolve around it.

Here's why:

* Galileo's Observations: Galileo Galilei, using his telescope, was the first to observe the four largest moons of Jupiter (Io, Europa, Ganymede, and Callisto). This was a significant discovery because it showed that not everything revolved around the Earth.

* Challenging the Geocentric Model: The prevailing geocentric model, championed by Ptolemy, claimed that the Earth was the center of the universe. Galileo's observations of Jupiter's moons contradicted this model, providing evidence that objects could orbit something other than Earth.

* Supporting Copernicus' Theory: Nicolaus Copernicus had proposed the heliocentric model decades earlier. Galileo's discoveries provided compelling observational support for Copernicus' theory, strengthening the case for the Sun being the center of our solar system.

While the discovery of Jupiter's moons did not single-handedly prove the heliocentric system, it was a crucial piece of evidence that helped sway scientists away from the geocentric model and towards the heliocentric model.