Unlike Earth’s blue sky, space is pitch black—even with billions of stars shining! This happens due to
1. No Atmosphere to Scatter Light
On Earth, sunlight scatters in all directions when it hits the atmosphere, making the sky appear blue. Since space has no atmosphere, there’s nothing to scatter light, making it dark.
2. Light Travels in a Straight Line
Light moves straight through space. Unless it hits something (like a planet or a star), it keeps moving indefinitely. This makes empty space look dark.
3. The Universe is Expanding
As space expands, light from distant stars stretches into invisible wavelengths (redshift), making some stars appear dimmer or invisible.
🧐 Did You Know? If you were on the Moon, the sky would still look black—even in the daytime!
💡 Explore more: How Light Travels in Space
