Question: Our galaxy, the Milky Way, is enormous. Here are some key measurements: Diameter: About 100,000 to 200,000 light-years across. The commonly cited value is around 120,000 light-years, but the outer regions (like the halo) may extend farther. Thickness: Roughly 1,000 light-years thick in the main disk, but the central bulge is much thicker. Number of Stars: Estimated to contain 100 to 400 billion stars. Mass: About 1.5 trillion times the mass of the Sun, much of which is in the form of dark matter. Would you like a visual comparison with other galaxies or the scale relative to the Solar System? Need Assignment Help?