Question

2025 astronomy fall final exam (1st semester)
which of the following was not one of galileo’s observations?
○ the dwarf planet pluto
○ the phases of venus
○ sunspots rotating thus the sun rotates
○ the sun and moon are not perfect spheres
○ the four moons of jupiter

Explanation:

Galileo made observations like the phases of Venus, sunspots (indicating the Sun's rotation), the imperfect spheres of the Sun and Moon, and Jupiter's four moons. Pluto was discovered in 1930, long after Galileo's time (he lived 1564 - 1642), so he couldn't have observed Pluto.

Answer:

A. The dwarf planet Pluto