Galileo's early telescopic work, including observations of the Moon, demonstrated that the heavens were what two key qualities?

Answer

Malleable and knowable through direct observation

The observations provided crucial evidence that the heavens were not fixed and perfect but were instead subject to change and could be understood empirically.

Galileo's early telescopic work, including observations of the Moon, demonstrated that the heavens were what two key qualities?
GalileoastronomytelescopeobservationMoon