Why is space dark?
104Space is dark due to a combination of fascinating factors—and it's not a lack of light. Here's the cosmic summary:
🧠 Main reasons for the darkness of space
Absence of atmosphere: On Earth, sunlight interacts with particles in the atmosphere, scattering and creating the blue sky. In space, there's no atmosphere to scatter the light, so the background remains black.
Olbers' Paradox: This classic astrophysics dilemma asks: if there are billions of stars, why isn't the sky completely illuminated? The answer involves the fact that:
The universe is neither infinite nor eternal—it's about 13.8 billion years old.
Light from very distant stars hasn't yet had time to reach us.
The expansion of the universe causes light from distant galaxies to be shifted to the infrared, making it invisible to our eyes.
Dark matter and cosmic dust: Space is not completely empty. There are clouds of gas and dust that absorb or block some of the light, contributing to darkness.
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