What question did Galileo's discovery open up, succeeding the debate he closed regarding the *nature* of the light?

Answer

Cosmic geography

Galileo’s observation effectively ended the debate over the nature of the light but immediately opened the much larger, more complex question of cosmic geography, focusing on how those stars were arranged.

What question did Galileo's discovery open up, succeeding the debate he closed regarding the *nature* of the light?
discoveryGalileoastronomytelescopeMilky Way