Answer:
The answer is "galaxies."
Explanation:
The "universe" is also called <em>"the cosmos."</em> It includes space, time and heavenly bodies such as<em> planets, sun, moon, galaxies, etc. </em>
A galaxy is considered to be a big collection of gas, dust, stars (including their solar systems). All of these are being held together by<em> "gravity." </em>The Earth's galaxy is called the<em> </em><u><em>"Milky Way."</em></u> The name is derived from how it appears from afar.
<em>Other than our galaxy, there are millions or even billions of other galaxies in the universe!</em> They come in different colors, shapes and sizes. They appear clustered together due to <em>"mutual gravity."</em> A cluster consists of hundreds to thousands of galaxies.
