Earth, the Sun, and billions of stars are contained

within

(1) a single constellation

(2) the Milky Way galaxy

(3) the solar system

(4) a giant cloud of gas

2. The Milky Way Galaxy,

Earth has no part of a constellation,

The solar system is made up of planets, no stars,

And a giant cloud of gas could envelop anything, not only stars and planets but other galaxies as well.