The Milky Way Galaxy is estimated to be 100,000 to 200,000 light years across. The size of the Milky Way is determined using both parallax and variable stars.
Artificial Twilight: One third of humanity can never see the Milky
Galaxies - WorldAtlas
World Atlas in The Known Worlds
Galaxies - WorldAtlas
Milky Way Galaxy - Students, Britannica Kids
99% of stars you can see with naked eye are inside this circle : r
Milky Way - Wikipedia
Milky Way, Astronomy Wiki
Milky Way - Wikipedia
Starry Night Vistas Includes the Milky Way at Sea Ranch