The three important discoveries of Galileo are:
1) Telescope
2)Milky way
3)Thermoscope
Thermoscope: It is the earlier version of thermometer for measuring the temperature discovered in the 16th century.
Telescope: It was invented to view far away objects like trees, birds etc and the celestial objects.
Milky way Galaxy: He discovered the milky way galaxy that contains our solar system.
