1. Copernicus and Galileo contributed tremendously in the field of astronomy by inventing new tools and implements to verify astronomical events.
2. Galileo was the first to develop the first telescope to watch the stars.
3. Copernicus was the first to declare that Earth is not flat and is not the centre of universe and it revolves around the sun.
4. Later on German scientist Kepler searched out other members of "Solar System".