Many times you might have heard or read through many articles or news that space is very cold and as you move higher in the space the temperature goes on decreasing. And to understand this fact properly, another question would also have arisen in your mind that if the sun is so hot then how can space be so cold. So while talking on this topic let's try to understand it in simple words, why and how this actually happens.
The temperature at the Sun's surface is nearly equal to 5,500 °C, and it is so hot that its heat comfortably reaches the earth 150 million km away. But the interesting thing is that the space where the Sun is present in the center, that space itself is so cold. Now how can it be possible that the sun whose heat reaches 150 million km away, but is not able to keep the space hot which it is actually a part of? The question depicts a very simple answer as there is no matter in space that can absorb the sun's heat because matter must always exist in space to absorb the light or heat from the sun, and this is the reason why space is cold.
This question also tries to raise another question in our minds that why is there always darkness in space, especially in the space between stars and planets? This can also be answered in the same sense that space is a nearly perfect vacuum, that is, completely devoid of matter, and in space, in the absence of matter, light travels in a straight line from its source to the receiver. Space comprises almost nothing between stars and planets that can scatter light to our eyes because the matter is always needed to feel the touch of light. And with no light reaching our eyes, space always seems black to us.
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