Children are always curious about the world. They always ask questions that adults think are nonsensical and boring. Sometimes they make us dumbfounded and don't know how to answer.
Many times, we will choose a perfunctory way to answer the questions raised by children. Unknowingly, we have slowly eroded children's curiosity and desire to explore the world.
For example, if your child asks this question: Why is the night sky dark? How would you answer?
Most people will answer directly: because there is no sun. This answer is indeed acceptable for children of several years old. When you do not touch the essence of the problem, you miss the opportunity for your children to have a deep understanding of the world.
I don’t know if you have ever thought about whether our universe is infinite? Is it static or dynamic?
If the universe is infinite and static, it means that there are infinite stars in the universe and the light they emit is also infinite. In this case, no matter how far the star is from the earth, there will always be infinite light shining on the earth. In this way, the sky should be bright whether it is night or day.
It is the same whether there is the sun or not, because the sun is just one of infinite stars, just like infinity minus one is still infinity!
But in fact this is not the case, the night sky we see is black. Why is this happening? This problem is also known as "Obers' Paradox".
Obviously, our universe is not infinite, nor is it static. In fact, scientists have discovered this a long time ago. As early as the 1920s, the famous scientist Hubble discovered that when observing the movement of distant galaxies, they were constantly moving away from the earth. This showed that our universe has been expanding, and the expanding universe has also become strong evidence of the Big Bang.
As the universe continues to expand, the wavelength of the light emitted by galaxies will continue to be stretched, and the wavelength will become longer and longer, resulting in red shift phenomenon , which is also a direct manifestation of the Doppler frequency shift.
Finally, when the light reaches the earth, the wavelength is stretched very long, and it has long since changed from visible light to microwaves, and microwaves cannot be seen by our naked eyes. This is also the reason why the night sky is so dark, because the light reaching the earth is very limited, and there is not enough light to illuminate the earth's night sky.
The cosmic microwave background radiation also appears under this background. It is the first ray of light produced after the Big Bang. It has long been stretched into microwaves after reaching the earth.
As the universe continues to expand, the wavelength of microwaves will continue to be stretched, eventually becoming radio waves or even disappearing completely!
can see that a seemingly simple question actually contains such a profound mystery of the universe, perhaps many people cannot believe it!
In fact, the most profound mysteries of the universe are often hidden in our daily lives. It’s just that our day-to-day life has made us accustomed to many natural phenomena. We take them for granted, and even become numb, and we don’t even ask why.
So, if your child asks you a seemingly boring question, don’t be perfunctory. It’s a good opportunity for him to learn about the world!
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