Your weird cousin, who is really into astronomy, decides that the return address he uses on his letters is incomplete! To his city, state, and country, he begins to add: "North America, Earth, Solar System..." If he now wants to include the name of the Galaxy’s spiral-structure feature in which the Earth is located, how should his address end?

His address should end with "The Milky Way Galaxy"

Explanation:

The earth is located in a solar system. Our solar system comprises of the sun, moon, planets such as Mercury, Venus, Mars, Earth etc.

The entire solar system is located in the Milky Way Galaxy. A galaxy is a collection of billions of stars, space dust and space gas as well as their solar system(s).

It's been proven that the Space Universe contains billions of galaxies.

Other galaxies besides the Milky Way where our solar system is situated are:

Cheers!