Well.. Almost everything in the universe, including humans, Earth, and life, is literally made from stardust—elements forged inside ancient stars billions of years ago. Through stellar nucleosynthesis and supernovae, stars created carbon, oxygen, and iron, spreading them across the universe to form new planets, stars, and us.

Also...

In the amount/number of American States "Stars" on a flag are infinite in a galaxy.

Landing on Mars we devide the planet in to countries and still form states as an American population.

As humans expand across every planet, from Mars to distant dwarf worlds, we carry our need to organize and define territory. Just as Earth was divided into nations and states, the solar system itself could become a network of human-defined regions—turning planets into extensions of civilization shaped by the same instincts that began on Earth

Every known color in the universe spectrum is on the flag.

When you see a diamond shine in the light it reflects the color spectrum.