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Why are many supernovae in the Milky Way difficult to see with visible light?
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Supernova
Composite image of Kepler's Nova, or Kepler's Supernova, taken by the Chandra X-ray Observatory.
Many supernovae in the Milky Way are difficult to observe with visible light primarily due to the presence of interstellar dust grains within the interstellar medium.
These dust grains scatter and absorb starlight, an effect that is more pronounced at shorter wavelengths, such as those in the visible spectrum. Because this dust is pervasive throughout the galaxy, it obscures the light from distant objects, including supernova events, by causing significant extinction and reddening of their light. While visible light is blocked, these events can often be studied using other wavelengths, such as infrared or radio, which are less affected by dust scattering.1