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The Solar System The Solar System consists of the Sun and its planetary system of eight planets, their moons and other objects including asteroids and meteors. Our planet Earth is one of the eight planets that revolve around the Sun. It's called a Solar System, because, the word 'Solar' means relating to the Sun. And, since the Sun is the center of most parts of the system, it is called the Solar System. Let's understand more about the planets and the Sun. Objects seem to be smaller in size when they are seen from a great distance, but, in reality are very huge and large. Similarly, the moon and stars are very big and huge in size, but, appear to be small in size to our eyes, because, they are very very far away from the Earth. The distance between the objects and the solar systems is so large that these numbers will run into the millions and billions of kilometers. Hence, they are measure using a specific unit called the 'Light year'. 1 Light year is exactly Nine quadrillion Four Hundred and Sixty trillion Seven Hundred and Thirty billion Four Hundred and Seventy Two Million Five Hundred and Eighty Thousand Eight Hundred meters. The Sun is only a 149 million kilometers away from the Earth. The Sun is very far from the Earth, and that is the reason why the Sun looks so small in size. The Solar System is the family of the Sun. The Sun is very big compared to the Moon, probably around 400 times bigger. The Sun is also a star, but remember, it's not the biggest star in the Universe. There're a lot of stars present in the Universe which are very far away from our Sun, some of them about thousands of light years away. That is why stars look like little dots in the night sky. The Sun, like all stars, is a ball of fire. It is continuously burning, because of Hydrogen reaction that happen inside the Sun. These reactions occur at every high temperature, and are responsible for the emission of the enormous light energy coming from the Sun, in the form of light rays. The Sunlight from the Sun takes about 8.5 minutes to reach the surface of the Earth. The Sun is the center of our Solar System, and all the planets revolve around the Sun in orbits. An orbit is a curved path of an object around a point in space. Orbit means moving around, and roaming. The Earth is one of the planets in the Solar System, and takes exactly 365.25 days to revolve around the Sun. The Earth also rotates around its own axis in 24 hours or in one day. Just like Earth, every planet rotates on its own axis, and revolves around the Sun, having different lengths of day and year. Let's learn about the planets in the order of their distance from the Sun, starting from the closest. Mercury: Mercury is the smallest of the planets. It is as hot as it is close to the Sun. And, hence, no living creature can live on this planet. Mercury was named after a Roman God Mercury, who is the fast flying messenger. Mercury takes only 88 days to revolve around the Sun, which makes it the fastest revolving planet. Venus: Venus is the second closest planet to the Sun. Did you know that Venus is called the Morning and Evening star? The reason for this is that Venus is visible in the Morning and Evening, as the brightest star from Earth. Venus takes about 244.7 days to orbit around the Sun, and, it is named after the Roman Goddess of love and beauty. Earth: Our planet Earth is the third closest planet to the Sun. It is blue in colour, and there is a lot of water present on the surface of the Earth. Water constitutes about 70% of the entire surface of our planet. Unlike Earth, the Moon is not a planet. It is a natural satellite of Earth, and, it revolves around the Earth. Satellite is a smaller body which rotates around another rotating body. Earth is the only planet which has animals, trees and human beings. Mars: Mars is called the red planet, because, it's red in colour. This red colour is the due to the presence if a chemical called Iron oxide. This Iron oxide is present on the surface of Mars, hence, giving it, it's red colour. Mars is named after the Roman God of war. It has two moons that in turn revolve around it. Jupiter: Jupiter is the biggest and largest planet of our Solar System, and, it is named after the Roman God Jupiter. Jupiter is 317 times the mass of Earth. Jupiter may have all the rocky core of the heavier elements, making it the biggest and heaviest planet. The outer atmosphere of Jupiter is divided into several bands, and different latitudes, resulting in extreme storms. Jupiter has 67 moons revolving around it. These are natural satellites of Jupiter. Saturn: Saturn is the only planet to have rings around it. Saturn is named after the Roman God of Agriculture. Saturn has over just 95 times the mass of Earth. The rings around Saturn are mostly composed of ice particles, and, some rocky debris and dust. Saturn has around 62 moons revolving around it. Uranus: Uranus is similar to Neptune, and, is named after the Greek God of Sky, Ouranos. It has around 27 natural satellites revolving around it. Uranus is unique. When compared to another planets, because of the fact that its axis of rotation is tilted sideways, unlike the other planets. It looks bluish-green in colour, because, the atmosphere of Uranus is very cold and cloudy. Neptune: Neptune is the farthest planet away from the Sun. It is about 17 times the size of the Earth. Neptune is light blue in colour, because, it is the coldest of all planets. Neptune is the densest of all planets, as well. It is named after the Roman God of Sea. There was another planetary object called Pluto, which was originally the 9th planet. But, it is no longer considered a planet, because, Pluto and its moons are considered to be a region. This region extends from the orbit of Neptune. There is a huge gap between Mars and Jupiter. This huge gap is called the Asteroid belt. This belt is occupied by a large number of irregularly shaped objects which are called Asteroids. These objects are often called as Minor Planets, because of their size. Thanks for watching. And, be sure to subscribe for more cool...

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Duration: 7 minutes and 40 seconds
Language: English
License: Dotsub - Standard License
Genre: None
Views: 4
Posted by: pgtranscribes on Apr 23, 2015

3.Topic 1-Video 2

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