Sometimes the interstellar matter in space is highly concentrated (along our line of sight, not all clumped together) that it’s impossible to see through with visible light. This is only because the dust and gas in space is covering the stars, not because there’s nothing there.
Astronomers often look at these regions in infrared, for infrared wavelengths are longer than visible light waves, and the length allows the light to pass through.
This causes the stars to appear to be more red, when in actuality, the stars themselves might be yellow or blue or white in color.
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