If light travels billions of miles from distant stars to reach us ...
[From: ] [author: ] [Date: 12-09-20] [Hit: ]
But it is very very weak by the time it gets to us, because it spreads out so much.Actually, the star light is also very very weak.Try reading outside in the middle of the day, with sunlight -- very easy.......
Stars are so far away that the heat they give off dissipates long before it can reach us over the vast distances it must travel, while the light keeps on going as photons that remain as descrete packages rather than as radiated waves.
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The heat DOES reach us, in the form of infra-red radiation. But it is very very weak by the time it gets to us, because it spreads out so much. Actually, the star light is also very very weak. Try reading outside in the middle of the day, with sunlight -- very easy. Now try it at night, without any moonlight. Using only starlight, it's impossible, even though there are thousands of stars shinning in the sky.
Professional telescopes use infra-red radiation to study stars.
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heat doesn't travel as far as light. Think about it, look at a candle in the dark from 50 feet away, you can see the light, but you don't feel the heat.
Also, many planets don't give off heat, the light you see if just the light reflecting off it from other stars.
Hope this helps :)
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Heat from the stars travels as infrared light. So yes, it does reach us. But the intensity is reduced the futher away you are. Same as moving away from a fire you dont feel as much heat. The amount of IR radiation that reaches us is just too small to be noticeable.
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Light drops off by the square of the distance, heat by the cube.
BTW, the nearest star, Proxima Centauri, is 26 TRillion miles away, not Billions
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Heat don't travel as far
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The heat *does* reach us. That's why it's warm at night when there's no sun.
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