Which two gas giants did Renaissance scientists such as Galileo know about

Answer 1

Renaissance scientists, including Galileo, were aware of two gas giants in our solar system: Jupiter and Saturn. Galileo made significant observations of Jupiter and its moons using his telescope in the early 17th century, which helped to establish the importance of observational astronomy. Saturn was also observed by Galileo, although he did not fully understand its rings and described it as having "ears."