The indefatigable pochemachka again overcomes the question: "Why does the sun shine in the daytime, and the stars at night?"
The growing man is interested in literally everything. He asks questions about everything he sees. Why is the grass green? Why does the sun shine in the daytime, and the stars at night? And stuff and stuff. The answer to seemingly simple questions is not always easy. Because sometimes there is not enough special knowledge. And how to explain the complicated in a simple way? Not everyone can do it.
What is a star?
Without this concept it is impossible to understand clearly,why the sun shines in the daytime, and the stars at night. Often the children of the stars are small dots in the sky, which they compare to small lamps or flashlights. If we draw an analogy, then they can be compared to huge searchlights. Because the stars are incredibly huge fireballs that are incredibly hot and are so far away from us that they seem like crumbs.
What is the sun?
First you need to report that the Sun isname, as name. And this name is the closest star to our planet. But why is not it a point? And because of what the sun shines in the daytime, and the stars at night, if they are the same?
The sun does not seem to be a point because it's muchcloser than others. Although it is also far away. If you measure the distance in kilometers, the number will be 150 million. This way the car will pass for 200 years, if it will be without stop moving with a constant speed equal to 80 km / h. Because of the incredibly long distance, the sun seems small, although it is such that it would easily accommodate a million planets like Earth.
By the way, the sun is not the biggest and not very bright star in our sky. It is just located in one place with our planet, and the rest are scattered far in space.
Why is the sun visible during the day?
First you need to remember: when does the day begin? The answer is simple: when the sun begins to shine from behind the horizon. Without his light, this is impossible. Therefore, when answering the question about why the sun shines during the day, we can say that the day itself does not come if the sun does not rise. After all, as soon as it goes beyond the horizon, there comes evening, and then - night. By the way, it's worth mentioning that the planet is not moving, it's the light. And the change of day to night is due to the fact that the planet Earth rotates around its fixed axis without stopping.
Why can not the stars be seen during the day, if they, likethe sun, shine always? This is due to the presence of our planet's atmosphere. In the air, the sun's rays dissipate and outshine the faint glow of the stars. After it sets, the dispersion stops, and nothing dims their dim light.
Why is the moon visible at night?
So, the sun shines in the daytime, and the stars at night. The reasons for this are in the air layer surrounding the earth. But why is the moon visible, then no? And when it is, it can take different forms - from a thin sickle to a bright circle. What does it depend on?
It turns out that the moon itself does not shine. It works like a mirror that reflects the sun's rays to the ground. And the observers can see only that part of the satellite that is illuminated. If we consider a whole cycle, it begins with a very thin month, which resembles an inverted letter "C" or an arc from the letter "P". Within a week it grows and becomes like a half of a circle. All next week he continues to increase and every day more and more approaching the full circle. The next two weeks, the picture decreases. And at the end of the month the moon completely disappears from the night sky. More precisely, it simply is not visible, because only that part of it that is turned away from the Earth is illuminated.
And what do people see in space?
The astronauts in orbit do not care about the question,why the sun shines in the daytime, and the stars at night. And this is due to the fact that both are seen simultaneously. This fact is explained by the absence of air, which prevents the light from the stars from passing through the scattered rays of the sun. You can call them lucky, because they can immediately see the nearest star, and those that are far away.
By the way, the night lights differ in color. And it is clearly visible even from the Earth. The main thing is to take a closer look. The hottest of them shine white and blue. Those stars that are colder than the previous ones are yellow. Our sun belongs to them. And the coldest ones emit red light.
Continuation of conversation about the stars
If the question of why the sun shines during the day, andstars at night, occurs in older children, then we can continue the conversation, remembering the constellations. They combine groups of stars that are in one place on the celestial sphere. That is, they seem to us located side by side. In fact, there can be a huge distance between them. If we could fly far away from the solar system, we would not recognize the starry sky. Because the outlines of the constellations would have changed a lot.
In these groups of stars, ancient people sawoutlines of human figures, objects and animals. In this regard, and there were different names. Large and Small Dipper, Orion, Swan, Southern Cross and many others. Today there are 88 constellations. Many of them are related myths and legends.
Because of the rotation of the Earth around the sun constellationschange their position in heaven. And some are generally visible only in a certain season. There are such constellations that can not be seen in the Northern or Southern Hemisphere.
Over time, the constellations lostsecondary stars, and according to their drawing it became difficult to guess how the name arose. The most famous constellation of the Northern Hemisphere - the Big Dipper - has now turned into a "ladle".