Why is space so dark?
Light's Lonely Race
Why is space so dark?
You've seen those photos of space — the blackness between stars, the deep darkness beyond Earth. Why is it so dark out there when the sun is right there, blazing away?
Here's the thing: light doesn't just hang around in the air like fog. Light is always moving — racing in straight lines at incredible speed, the fastest thing in the universe. When a beam of light leaves the sun, it shoots past you and keeps going. It doesn't stop to light up the emptiness.
