Schoolwork and essays from secondary school
Search schoolwork



The Sun is a star that is at the center of our solar system. It gives us warmth, energy and everything else that we need to live. Without it, nothing would live on Earth could exist. All the planets in our solar system has its own orbit around the sun. They are retained by gravity formed when circulates in its path. Earth is the only planet that has the correct distance from the sun for there to be life here. The solar radiation that affects the photosynthesis that gives us oxygen. But the sun can also be dangerous. They contain UV radiation that can lead to skin cancer. It also means that we get sunburn.


The sun is a star among billions of others in the space. It is a burning orb composed of hot gases. It is about 4.6 billion years old, and can expect to live for about 5 billion years. When the time has elapsed, so the sun will swell to a red giant and swallow all of the nearest planets. Then it will become white and shrink again before it goes out completely. The planets that are not burned will then be pre-frozen and fly away freely in space, because the gravity of the sun no longer holds them.
It is about 1.4 million kilometers in diameter (109 times further than Earth). The sun's total mass is more than 333 000 times larger than Earth. It alone represents 99.85 percent of the mass of the solar system!
It is difficult to determine the sun's exact size and weight because the weight is steadily declining. Every second becomes about 4 million tons lighter. This is because its mass is converted into energy and leaves it together with the sun rays.
There are about 150 million kilometers from Earth and the Sun (that's an average because the distance changes all the time) and it takes about eight minutes for the sun's rays to pass by that piece. Light moves then at a speed of 300,000 km / s, and there is nothing that we know of that moves faster. In the past, it was thought that light moved slowly in helium but now we know that the speed is the same everywhere. At the surface (photosphere) the sun has a temperature of 6000 degrees C. At the core, the temperature is about 15 million degrees. The sun's brightness is about 390 megawatts kvantiljoner! (I have no idea how many zeros there are in it but it sounds at least much).

Photosynthesis, energy and växthusefekten
All life comes from the sun from the beginning.
Inside the sun formed small explotioner (fusion). Explotionerna converted to energy. When sun rays coming to Earth and found such a tree is transmitted solar energy to the blades. This in turn starts together with water and carbon dioxide photosynthesis. It's thanks to photosynthesis as we get the oxygen that we breathe. If the energy hits such a torrent that converts energy into kinetic energy. We can take advantage of energy by eg building a hydropower aches. Then go the energy out of our home landline converted into electricity. The sun gives us heat. The whole earth had been covered by ice and impossible to live if the sun had not shone as strongly.

Växthusefekt means basically the same amount of energy coming to Earth studdsar out again. However, we are currently moving towards a total växthusefekt which means that the atmosphere is so thick that energy can not be studdsa out again, just set. When the temperature would rise and and it would be a lot of natural disasters, such as the north and south poles would melt.


The sun's rays can also be dangerous for us. This is because they contain the ultraviolet radiation, an invisible radiation which in large quantities can lead to skin cancer. Therefore, you should not stay out in the sun too much, especially not if you're pale. The best way to protect against UV radiation is to use sunscreen but even if you have sunscreen should not stay too much in the sun between 11 -16. When suns that are formed more pigment color in the skin to protect it against UV radiation. Tan is an inflammation of the skin that formed when the skin is subjected to too much UV radiation. Some believe it is better to use a sunbed but efekten is the same as the radiation from it is just as dangerous as that of the sun.


The sun's attraction also affects us here on earth. It is because of the sun and moon's gravitational forces that we have ebb and flow. The attraction of the moon is stronger the closer the moon we are. Therefore, the attraction greater on the side of the Earth are the moon and less on the side facing the sun. The sun's pull is actually much stronger than the moon, but since the sun is so far away is the moon's attraction greater impact on us.
When the water is pulled toward the moon becomes the river. But when the earth turns towards the sun, it is the sun's attraction that takes over.


When I would start to write, I had really hard to decide what I would förljupa me. You'd would always write what the sun does for one but when I started to think, I had no idea. The sun is something that is just there, because I never thought of it before. One knows for example that the whole earth would be covered with ice unless the sun shone so strong but I have never thought about what it actually is would mean. You had to think a lot when to start writing.
I find it so amazing that everything just rolls on, all about energy and photosynthesis. We think we are so smart that has invented all the machines, but nature works in a completely different way. It works by itself, without the need to press any buttons or keep track of everything is working as it should. Everything is dependent. If only the slightest thing had been different, we might never have existed. Remember that the sun's rays are not at all included energy, which had nothing alive here existed. And even if we would have managed without energy so would not photosynthesis have worked so then we had not received any oxygen.
I think it's pretty awesome that energy remains in the object it hit and not just studdsar away again. And that we can capture the energy and anvnvända it to such electricity.
But I do not really understand where energy comes from. The energy produced by the fusion (it is in any case as I understand it) but from the beginning, you have the energy to have come from somewhere else. The merger would not have worked if the sun had been warm but the sun needs the energy to get warm? And the Big Bang could not have come from nothing, there must have been energy to explotionen occur at all.
On the internet pages that I looked at it was that the sun is about 4.6 billion years old. But on one side of the earth as it was that the earth was also 4.6 billion years and I thought the sun had been around much longer a planet. I think it pains a little strange that both the Sun and the Earth formed at the same time.
I find it hard to get a picture of how big the Sun really is. One knows that it is huge but it was only when I started writing that I understood how big. It said that every second you lose the approximately 4 million tonnes. One would think that if it loses so much weight all the time so it should fall quite visibly every day. But it does not, therefore, the importance to be insignificant in gemförese but his own.

Linda Lundquist

based on 15 ratings Sun, 2.3 out of 5 based on 15 ratings
| More
Rate Sun

Related school projects
The following are school projects dealing with the sun, or in any way related with the sun.

Comment Sun