Why does the Milky Way appear as a glowing band across Earth’s night sky?

The Milky Way appears as a glowing, irregular band of light across Earth’s night sky because we are viewing our own galaxy from within its disk.12

Because the solar system is located close to the galaxy's equatorial plane, looking toward the disk reveals a vast, concentrated number of faint stars and gas clouds that appear to merge into a single, luminous band. This band is composed of the light from these numerous stars, which are so distant and densely packed from our perspective that they create a continuous, milky appearance.3124

While this band is primarily defined by the distribution of stars, the view is also influenced by the interstellar medium, which includes gas and dust. This dust can obscure and dim the light of stars, affecting how the galaxy appears to observers on Earth.5