What range of magnification did Galileo achieve that fundamentally changed what was visible in astronomy?

Answer

Approximately $20 imes$ or $30 imes$

The breakthrough moment for astronomy occurred when Galileo successfully created instruments capable of magnifying objects approximately $20 imes$ or $30 imes$.

What range of magnification did Galileo achieve that fundamentally changed what was visible in astronomy?
Galileotelescopeinstrumentobservationsky