Explanation

A galaxy is a gravitational system of stars, star remnants, interstellar gas, dust, and dark matter.

Earth: diameter of approximately 12,742 kilometers (7,918 miles)

The Sun: diameter of approximately 1,392,684 kilometers (865,374 miles)

Solar System: diameter of approximately 9.2 billion kilometers (5.7 billion miles)

Galaxy (Milky Way): diameter of approximately 100,000 to 200,000 light-years (9.461 × 10^17 to 1.884 × 10^18 kilometers)