Due to absorption of shorter wavelengths by interstellar dust clouds, distant stars appear:

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Interstellar dust clouds absorb shorter wavelengths of light, which means that longer wavelengths (such as red) are more likely to reach us. Therefore, distant stars appear redder, not bluer or brighter. Interstellar dust clouds absorb shorter wavelengths more strongly than longer wavelengths. This means that shorter wavelengths are more likely to be scattered and absorbed by the dust before they reach us. As a result, the remaining light that we receive from distant stars appears redder than it should be. This effect is known as interstellar reddening.

Due to Absorption of Shorter Wavelengths by Interstellar Dust Clouds