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 surface of the sun is called photosphere. The temperature of the photosphere is 5,778 K. It is, however, much hotter at the core of the sun, being 15.7 million K. The energy is produced via a process known as nuclear fusion. This involves 2 hydrogen nuclei joining to form 1 helium nucleus, releasing energy.
A distance of 149.6 million kilometers separates the sun and the earth. The sun has a diameter of 1.392 million kilometers and an equatorial circumference of 4.379 million kilometers. These values are 109 times higher than the corresponding earth's measurements. Its surface area is 11,990 times that of earth, measuring 6.0877 trillion kilometer squared. Its volume is 1.3 trillion times that of earth.
The energy from the sun is called solar energy. It is received by the earth through radiation. Since only a fraction of the radiated energy can be absorbed by our planet, a lot of it is reflected back to space. Life on earth depends on the absorbed energy. It is also responsible for our weather, tides and the 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.
Providing unlimited light and heat, the sun is the main source of energy to the earth. Extra applications of solar energy include lighting, generating electricity and in enhancing growth of plants in green houses. Considering all these factors, it is true to say that there can be no life on earth without the sun.
The surface of the sun is called photosphere. The temperature of the photosphere is 5,778 K. It is, however, much hotter at the core of the sun, being 15.7 million K. The energy is produced via a process known as nuclear fusion. This involves 2 hydrogen nuclei joining to form 1 helium nucleus, releasing energy.
A distance of 149.6 million kilometers separates the sun and the earth. The sun has a diameter of 1.392 million kilometers and an equatorial circumference of 4.379 million kilometers. These values are 109 times higher than the corresponding earth's measurements. Its surface area is 11,990 times that of earth, measuring 6.0877 trillion kilometer squared. Its volume is 1.3 trillion times that of earth.
The energy from the sun is called solar energy. It is received by the earth through radiation. Since only a fraction of the radiated energy can be absorbed by our planet, a lot of it is reflected back to space. Life on earth depends on the absorbed energy. It is also responsible for our weather, tides and the 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.
Providing unlimited light and heat, the sun is the main source of energy to the earth. Extra applications of solar energy include lighting, generating electricity and in enhancing growth of plants in green houses. Considering all these factors, it is true to say that there can be no life on earth without the sun.
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