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Posts Tagged ‘Why is space dark?’

When I was younger, I always wondered this.  The sun is phenomenally powerful in providing heat and light.  The earth is very far away from this star and yet we are lit up perfectly in the daytime.  Surely space should be an even hotter and brighter place with it being closer to the sun?  When I took physics A level, I finally learned the answer.  We can only see light when it bounces off an object and enters our eye.  There are no objects in space, it is a vacuum.  Therefore, when light from the sun passes through to us, it hits nothing, meaning we see no rays.  When the light rays meet Earth, light is reflected off the many objects and surfaces, allowing us to see.  Good times!  (Oh and as for heat, the closer you get to the mighty sun, the hotter it gets).

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