Thinking about the end of the universe

When you look at the night sky, you can see many stars.

A dark space full of hundreds of stars, it's cosmos.

When we talk about the universe, there is always a question.

It is the question of how big is the universe and where is the end.

We use light to see the size of the universe.

We know that light is the fastest in the universe.

The light at the time of the birth of the universe can be thought of as flying at the speed of light from beginning to end.

In other words, if the universe is about 13.8 billion years old, and the light has reached 13.8 billion years, then the radius of the universe is about 13.8 billion light years.

(Light years: the distance that light travels for one year, the light travels about 300,000km in one second, and the distance for one year is about 9,460,000,000,000km. This is one light year.)

But the universe continues to expand.

Even now thinking about the size of the universe, the universe is getting bigger.

Knowing the radius does not mean that you can measure its size.

We can not know at the moment where the center of the universe is.

Think of the universe as a balloon.

We can see the inflated balloon and the center of the balloon.

The reason is that we look at the balloon outside the balloon.

But the universe is different.

We are attached to a point in the balloon of space.

So, if you look at the other points, you just look away from each other.

It is not known where the balloon center is located.

We think of ourselves as the center of the universe.

We recognize that we are stopped.

We are one of the things that are moving away from this wide universe.

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Personality education at school and at home. And a good movie for personality education

I have been able to hear the word 'personality' in our society from time to time. In the field of education, there are a lot of policies and materials about personality education. There is a reason why something floats on the surface. Personality education in the Republic of Korea's Personality Education Promotion Act is "education aimed at cultivating the inner personality of oneself, cultivating soundly and cultivating the human character and ability necessary for living with others, communities and nature". In short, it is education to become a human being. So why did the education for human beings come from here and there? If you think easily, many human incidents are not human. The age at which violence occurs and accidents occur is getting lower, and crimes that can not be thought of by people are frequent, and they have felt the seriousness of society as a whole. Unfamiliar forms call for education to become human beings. We can think of it ...

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Major changes in adolescence organized by mind map

We generally refer to adolescence as a process in which children who depend on their parents are transformed into independent adults. In fact, the beginning and end of adolescence is not clear. We say adolescence roughly between the ages of 11 and 20. If you think only of your age, you can say that you are in adolescence from the fourth grade of elementary school (Korea standard). However, the more accurate than the age is the students who can see with eyes. The rate of change and change experienced by young people is highly individualistic. Usually, girls experience changes earlier than boys. Adolescence changes for a very long time. And change is not a change that starts at the end of the first. Changes can be made at the same time or at different times. So it is difficult to find out how the youth of this period will change. The following picture is a summary of the major changes in adolescence. Mind Map is an effective tool for organizing and showing these c...

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Cluttered and distracted classroom, cause is that student?

Do you know the ancient Greek philosopher Empedocles? He said that all things come from the combination of the four basic elements. Cold and dry soil, hot and humid air, hot and dry 'fire' and cold and humid 'water' claimed to be able to explain the properties of all materials. Hippocrates, a Greek medical scientist familiar with the "Hippocratic oath," also said that the human body consists of four elements: earth, air, fire, and water. Based on this, the human body has claimed that there are four fluids. And the disease is said to occur when the harmony of the four fluids is broken. Two hundred years later, the Roman physician 'Galen' insisted that the body fluids present in the human body are related not only to health but also to disposition or 'temperament'. Galen says that when one of the four fluids develops too much, it shows a corresponding tendency. The first temperament is 'depressed'. This temperament is sad an...

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