Why is space cold but sunlight burns?
Sun's Delivery Trick
Why is space cold but sunlight burns?
You've probably heard that space is freezing cold — millions of degrees below zero. But when you step outside on a sunny day, the sunlight feels HOT on your skin. Wait. If space is so cold, why does the sun's light burn? Shouldn't it arrive frozen?
Here's the trick: heat needs STUFF to travel through. When something is hot — your hand, a campfire, the sun — its atoms jiggle really fast. Heat spreads when those jiggling atoms bump into their neighbors, making THEM jiggle, too. It's like a crowd doing the wave at a stadium: the motion passes from person to person because they're touching.
