The sun is one of the numerous stars in the sky. It is the closest star to the earth and lies at the center of the solar system. One rotation of the sun takes 27 days. It is 4.5 billion years old, which is thought to be its mid age. This means it shall keep shining for about five billion more years to come.
The sun's surface is known as the photosphere. Its temperature is about 5,778 K. The sun's core is, however, much hotter, with its temperature being about 15.7 million K. All this energy is produced via nuclear fusion. This is a nuclear reaction where two hydrogen nuclei fuse to form one helium nucleus, accompanied by release of energy.
The distance from the Earth to the sun is 149.6 million kilometers. The diameter of the sun is 1.392 million kilometers. It has an equatorial circumference of 4.379 million kilometers. These measurements represent 109 times the corresponding measurements of the earth. The sun has a surface area of 6.0877 trillion kilometer squared, about 11,990 times that of the earth. It has a volume 1.3 million times that of earth.
The heat from the sun reaches the earth through radiation. This energy is known as solar energy. Note that the planet absorbs only a small portion of this energy, the rest is reflected back to space. The absorbed heat is responsible for life on earth. It is also the source of the earth's climate, wind trends and water cycle.
Plants use solar energy to make their own food, through a process called photosynthesis. This is the basic process that makes food available to all other living things. The sun is also responsible for the energy stored in fossils, as well as petroleum and coal.
The sun is earth's basic source of energy. This energy reaches us in two main forms, light and heat. Solar energy is also applied in promoting plant growth in green houses, solar lighting and powering electronic devices. There cannot be life on earth without the sun.
The sun's surface is known as the photosphere. Its temperature is about 5,778 K. The sun's core is, however, much hotter, with its temperature being about 15.7 million K. All this energy is produced via nuclear fusion. This is a nuclear reaction where two hydrogen nuclei fuse to form one helium nucleus, accompanied by release of energy.
The distance from the Earth to the sun is 149.6 million kilometers. The diameter of the sun is 1.392 million kilometers. It has an equatorial circumference of 4.379 million kilometers. These measurements represent 109 times the corresponding measurements of the earth. The sun has a surface area of 6.0877 trillion kilometer squared, about 11,990 times that of the earth. It has a volume 1.3 million times that of earth.
The heat from the sun reaches the earth through radiation. This energy is known as solar energy. Note that the planet absorbs only a small portion of this energy, the rest is reflected back to space. The absorbed heat is responsible for life on earth. It is also the source of the earth's climate, wind trends and water cycle.
Plants use solar energy to make their own food, through a process called photosynthesis. This is the basic process that makes food available to all other living things. The sun is also responsible for the energy stored in fossils, as well as petroleum and coal.
The sun is earth's basic source of energy. This energy reaches us in two main forms, light and heat. Solar energy is also applied in promoting plant growth in green houses, solar lighting and powering electronic devices. There cannot be life on earth without the sun.
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