* Constellations are patterns of stars: Constellations are simply groupings of stars that appear close together in the sky from our perspective on Earth. These stars are all part of our own Milky Way galaxy.
* Our view is limited: While the Milky Way is vast, our view is limited by the dust and gas clouds that obscure our vision of the galaxy's center. We can only see a portion of the Milky Way's stars, which form the constellations we know.
* Other galaxies are too far: Other galaxies are incredibly distant, and their stars are too faint to be seen with the naked eye. Even with powerful telescopes, most other galaxies appear as fuzzy patches of light.
Therefore, all the stars that make up the constellations we see are within the Milky Way galaxy.
