Question

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

Answer 1

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.