A satellite is a celestial body that revolves around the planets in the same way as the planets revolve around the Sun.
Some important information about planets
- The eight planets are roughly circular in shape.
- Inner planets have a higher density because they are made of rocks.
- Inner planets are very close to the Sun. They are made of rocks.
Outer planets - are far away from the Sun and are of very large size. They are made up of gases and liquids.
Solar System: How nice it is to look at the sky after sunset. At first one or two shining dots are visible in the sky, but later their number increases. You cannot count them. The whole sky is filled with small bright objects, some of which are bright and some are faint. It seems as if there are jade diamonds in the sky. Some of these seem to twinkle. But if you look carefully at them, you will find that some of them have a different flicker. They shine like the moon without any twinkle.
The Solar System consists of the Sun, eight planets, satellites, and some other celestial bodies, such as asteroids and meteorites that together form the Solar System. And we call it the solar family, headed by the Sun.
In the Solar System, the Sun and the planets and celestial bodies that revolve around them, in this chapter, you may be able to identify, describe and describe the members of the Solar System.
Special Things From the Solar System
- Our one solar family which includes Sun, planets, satellites, meteorites etc.
- The solar system consists of the Sun and a solar family of planets orbiting them
- A celestial body with a planet orbiting the Sun and satellites of the planets.
- Such as the asteroids and meteorites that make up the solar system
- May be able to identify, describe the members of the solar system
There are eight planets in our solar system. According to their distance from the Sun they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune etc.
Eight 'planet' orbiting the Sun
Mercury- One revolution around the Sun - 88 days, rotation on its own axis - in 59 days
Venus - One revolution around the Sun - 255 days, and rotation on its own axis - 243 days
Earth - One revolution around the Sun takes 365 days, and the rotation on its axis takes 1 day, the number of moons being 1.
Mars - In making this planet one revolution around the Sun - 687 days, rotation on its axis - 1 day, the number of their moons is also 1.
Jupiter - This planet revolves around the Sun one more time - 11 years, 11 months, about 12 years. Rotation on its axis - 9 hours 56 minutes, the number of the moon 53
Saturn - It revolves around the Sun - 29 years 5 months. A rotation on its axis takes 10 hours 40 minutes. The number of moons is about 53.
Uranus - It would have taken 84 years for this planet to revolve around the Sun. And the rotation on its axis - takes 17 hours 14 minutes, the number of their moons is about 27.
Neptune - One orbit around the Sun takes 164 years, the longest it takes for this planet to revolve around the Sun.
Earth - is the third planet according to its distance from the Sun. It is the fifth largest house in size. It is a bit flat near the poles. This is the reason that its shape is called Bu-ab ha, which means the size of the earth.
Favorable conditions for life are probably found only on Earth. Earth is neither too hot nor too cold. Water and air are present here which are necessary for our life, the gases necessary for life such as oxygen are present in the air, for these reasons the earth is the most wonderful planet of the solar system. Earth appears blue when viewed from space because two-thirds of its surface is covered with water. That's why it is called blue house.
Sub-Planet About Moon
Our Earth has only one satellite, the Moon, its diameter is only one-fourth of the diameter of the Earth. It appears so large because it is closer to our planet than other celestial bodies. It is about 3,84,400 kilometres away from us. Now you can compare the distances of the Sun and the Moon from the Earth.
The moon completes one revolution of the earth in about 27. In about the same time, it also completes one revolution on its axis. As a result, we can see only one side of the Moon from Earth.The conditions of Moon are not favorable for life. On its surface there are mountains, plains and pits which cast shadows on the surface of the moon. On the full moon day, their shadow can be seen on the moon.
Asteroids and Meteorites
Asteroids - In addition to stars, planets and satellites, innumerable small bodies also revolve around the Sun. These bodies are called small planets. These are found between the orbits of Mars and Jupiter, according to scientists, the asteroids are part of the planets, which broke away from the planets after an explosion many years ago.
Meteorite - Small pieces of stones that revolve around the Sun are called meteorites. Sometimes these meteorites come so close to the earth that they have a tendency to fall on the earth. During this process, due to friction with air, they get heated and burn. As a result, bright light is produced. Sometimes a meteor falls on the earth without burning completely, causing craters on the surface.
Have you seen a bright path like a wide white stripe in the starry, open sky from one side to the other? This is a group of millions of stars, this is the belt galaxy (Milky Way). Our solar system is a part of this galaxy. In ancient India it was visualized as a flowing river of light in the sky. Thus it was named galaxy. Galaxies are a system of millions of stars, clouds and gases. Millions of such galaxies come together to form the universe. It is extremely difficult to imagine the vastness of the universe. Scientists are still trying to collect more and more information about it, but still we know that we are all part of this universe.