Final answer:
Distances between galaxies are measured in light-years, while a solar system consists of a star and its orbiting bodies, whereas a galaxy contains billions of stars and their solar systems.
Explanation:
Distances Between Galaxies
In the universe, distances between galaxies are often described using the unit of light-years. A light-year is the distance that light travels in one year, which is approximately 5.88 trillion miles (9.5 trillion kilometers). This unit is more practical than the astronomical unit (AU), which is primarily used to measure distances within our solar system. For instance, the Andromeda Galaxy, the nearest spiral galaxy to the Milky Way, is about 2.537 million light-years away.
Difference Between Solar System and Galaxy
A solar system consists of a star and the celestial bodies that orbit it, such as planets, moons, asteroids, and comets. For example, our solar system includes the Sun, Earth, and other planets orbiting the Sun. In contrast, a galaxy is a massive system that contains billions of stars along with their solar systems, gas, dust, and dark matter. The Milky Way, in which we reside, is a prime example of a galaxy that contains numerous solar systems.
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