sun

The Sun is the star at the center of the Solar System. A star is called a sun if it is the center of a planetary system. A large number of planets have been found that orbit other stars thus making these stars officially suns. Other stars may be larger brighter’ smaller or fainter than our Sun but they are so very far away that we only see them as points of light in the night sky. The Earth is one of nine planets that orbit round the Sun in what we call the Solar System. Chances are that a large percentage of the stars in the galaxy also have planets orbiting them which would make them suns as well. It is a nearly perfect sphere of hot plasma with internal convective motion that generates a magnetic field via a dynamo process. It is by far the most important source of energy for life on Earth. The Sun is a star just like the ones you can see in the night sky’ but much closer. Sun is a rather ordinary star it's not particularly big or particularly small it's not particularly young or particularly old. Just an ordinary run of the mill star. Since it is so close to Earth it is the one star that we can mostly easily study. The Sun is a huge glowing sphere of hot gas. Most of this gas is hydrogen about 80% and helium about 29%. Carbon nitrogen and oxygen make up 1.6% and the other 0.6% is made up of small amounts of many other elements such as neon iron’ silicon magnesium and sulfur. The star round which the earth orbits. The sun shone from a cloudless sky. he watched the sun go down over the sea. Make sure you head back to the city in good time’ though you would not want to get stuck in this wilderness’ even in the late spring and summer when the sun hardly sets. The Sun appears so large compared to the other stars because it is so much closer to us than any other star. The Sun is just an average sized star. For example below is a list of some of the largest stars in our galaxy and how they compare to our Sun Mu Cephi about 1600 times the size of our sun. It is the gravitational energy that it derives from its huge mass. On the other hand fusion is producing energy at its core which creates an outward radiation pressure which balances the gravitational pull. This constant motion of high temperature causes a nuclear reaction. In the core of the Sun hydrogen turns into helium and causes a fusion which moves to the surface of the Sun escaping into space as electromagnetic radiation a blinding light’ and incredible levels of solar heat. The sun will eventually burn out. But not for a long, long time. The sun burns using a nuclear fusion process combining hydrogen into helium. When the sun runs out of hydrogen it will fuse helium and other heavier elements until it runs out of fuel. The Sun isn't made of fire. It's made mostly of hydrogen and helium. Its heat and light come from nuclear fusion, a very different process that doesn't require oxygen. Ordinary fire is a chemical reaction fusion merges hydrogen nuclei into helium and produces much more energy. The sun burns using a nuclear fusion process combining hydrogen into helium. The Sun is abutting 5.6 billion years old now. It is about 200 degrees hotter and abput 7% greater in radius than when it was first born. It will continue to increase’ in temperature’ luminosity and radius at about the same rate for about another 6 billion years. It just may be that brief periods of unprotected exposure to the sun are actually good for your skin. That is the suggestion from early research conducted at Stanford University. Sunlight triggers the synthesis of vitamin D within the body. Mostly people believe that lying out in the sun and getting a tan may help treat acne. Since getting a tan can help hide the discoloration acne can cause, and sun exposure sometimes dries up excess oil, it may look like the sun is helping to clear up the skin. While your body naturally produces vitamin D when you're in the sun UV rays are also a major cause of melanoma and other skin cancer. Sun exposure can also damage your hair which we'll discuss below. People suffering from vitiligo and white patches can benefit from sitting under the sun by inducing some pigmentation around the area she says. Not many realise that it’s only the early morning sun that is from 7 am to 9 am that helps generate Vitamin D. After 10 am exposure to sunlight is harmful for the body.