There are eight planets in our solar system. Apart from revolving around the sun, each planet rotates, or spins, about its axis. The four planets closest to the sun—Mercury, Venus, Earth and Mars—are small, rocky planets. They are called terrestrial earthlike planets. The other four planets—Jupiter, Saturn, Uranus and Neptune—are giants in comparison. They are made up mainly of gases.
They are called gas giants or Jovian Jupiter like planets. All the gas giants have rings around them. Since they are very far from the sun, the gas giants are much colder than the terrestrial planets. While stars twinkle, planets shine with a steady light. You can see some of the planets with the naked eyes or with the help of a good pair of binoculars.
Just remember that as the planets move around the sun, they appear at different positions in the sky at different times of the year. And for the period they are behind the sun, they are not visible. Mercury, the smallest planet of our solar system, revolves around the sun the fastest.
But it rotates on its axis at a much slower speed than the earth. So, a day on Mercury is about 58 times longer than a day on earth. Although Mercury is the closest to the sun, it is not the hottest planet.
Its thin atmosphere cannot trap heat. You can see Mercury near the eastern horizon before sunrise at certain times of the year. And at certain other times, you can see it near the western horizon after sunset. The thick atmosphere of Venus makes it the brightest and the hottest planet of the solar system.
Its atmosphere has mainly carbon dioxide gas, which reflects a lot of sunlight. Venus takes days to complete one rotation, making its day the longest in the solar system.
As a matter of fact, a day on Venus is longer than its year! It is easy to spot Venus because it is so bright. When it is visible in the east before sunrise, it is called a morning star. And when it is visible in the west in the evening, it is called an evening star.
The earth is not the fastest, slowest, hottest, coldest, largest or smallest planet. But it is the only planet on which life is known to exist. Were it nearer the sun, the water on it would have evaporated. Were it farther away, all our oceans, rivers and lakes would have frozen.
Plants use it to make food—which feeds, directly or indirectly, all animals. It also traps just enough heat to ensure that the nights on earth do not become freezing cold. No other planet evokes so much interest as Mars does. This is because scientists have found evidence that liquid water once flowed through the channels visible on its surface. So it is possible that some form of life once existed on this planet. The rust-coloured soil of Mars gives it a red colour.
So, it is also called the Red Planet. When visible, Mars looks like a red sphere. During its two-year orbit, it looks the brightest when the earth is between the sun and Mars. During this time, you can see it rise in the east as the sun sets in the west. Jupiter is the largest and the heaviest planet of our solar system. It also has the largest number of moons. The strong winds blowing on it, and on the other gas giants, create light and dark areas, giving them a striped look.
This spot is actually a huge storm, which has been raging on Jupiter for more than years. In , the Voyager 1 spacecraft discovered faint rings around Jupiter.
These rings are not visible even through the most powerful earth-based telescopes. Jupiter is also visible to the naked eye. It looks like a bright spot in the sky. These rings are actually particles of dust and ice revolving around Saturn. Apart from these particles, a large number of moons orbit this planet.
Uranus and Neptune are the third and the fourth largest planets respectively. Yet, they were the last two planets to be discovered. That is because they are so far away from us. Even today, we know very little about them. An object revolving around a celestial body is known as a satellite. All planets except Mercury and Venus have natural satellites, or moons, revolving around them. So far, we know of more than planetary moons. Some of them are so small that they were discovered only when spacecraft flew past them.
A few of the moons are almost as large as planets. It is even larger than Mercury. It shines by reflecting sunlight. If you look at the moon through a telescope or a good pair of binoculars, you will see a number of craters on its surface. These are large depressions created when huge rocks from space hit the moon. The moon does not have water or an atmosphere. It also does not have life on it. The moon takes 27 days and 8 hours to complete one revolution around the earth.
In this time it also completes one rotation around its axis. We see different shapes of the moon as it travels around the earth. Stand in front of a lamp in a darkened room. Hold a ball in your outstretched arm and move it around you, just as the moon moves around the earth. A friend standing some distance away from you will always see half of the ball moon lit by the lamp sun.
But to you earth the shape of the lit portion will keep on changing, like the changing shapes of the moon. Sunlight lights up half of the moon. As the moon revolves around the earth, we see different parts of the sunlit half. The shapes of these parts are called the phases of the moon. When the entire side facing the earth is sunlit, the moon appears as a full disc. We call this the full moon or purnima. And when the side of the moon facing us gets no sunlight, we do not see the moon. This is called the new moon or amavasya.
After the new moon, the moon appears as a thin crescent. As days pass, we see larger portions of the moon till the full moon appears. After this, the size of the moon visible to us gradually decreases till we once again have the new moon. The whole cycle of one new moon to the next takes So the new moon and the full moon appear about fifteen days from each other. A dwarf planet is a small, round body that orbits the sun. At the time of its formation, a dwarf planet could not pull in all other objects near its orbit.
So it is not considered a planet. Pluto, which was previously considered a planet, is now considered a dwarf planet. Ceres and Eris are two other dwarf planets. In a belt between the orbits of Mars and Jupiter, millions of small, irregular, rocky bodies revolve around the sun.
These are asteroids, and the belt is known as the asteroid belt. Asteroids are also called minor planets. Scientists think that asteroids are pieces of material that failed to come together to form a planet when the solar system was being formed. Nevertheless, by studying them and finding the answers, you will be well prepared to suceed! Although Venus and the Earth are similar in size and density, they have radically different atmospheres and surfaces.
What factors caused the two planets to develop so differently? What are common characteristics of the Jovian planets? What are some noteworthy differences between them? What factors in the formation of these planets led to these differences? What are some basic characteristics of the last three objects?
If astronomers gathered world wide to decide whether Pluto should be considered one of the nine planets, what do you think they would decide? On what would they base their decision? Could Mars support liquid water and life on its surface now? Explain why or why not. What factors led to the differences between Mars atmosphere and the Earth's?
What factors cause Io's surface to be this way? What relation does this process have to the possible internal heat source of Europa? Explain why current methods for discovering extra-solar planets are inadequate for finding planets much smaller than Jupiter. What methods are being devised for searching for terrestrial planets? Before we ever had close-up pictures of Europa, Scientists suspected that it might harbor liquid oceans. What theoretical reasons did they have for believing that such oceans might exist?
Now that we have close up pictures and physical data from the Voyager and Galileo missions, what observational evidence do we have for liquid oceans? It is possible to argue that there are three classes of planets in the solar system, rarther than the traditional two types. How would you seperate the planets? On what reasoning would you base these seperation? What are the differences between comets and asteroids?
Which type do you think poses more a of a danger in terms of an Earth impact?
Here is your essay on Solar System! The solar system consists of the Sun; the nine planets, 67 satellites of the planets and a large number of small bodies (comets and asteroids). The inner solar system contains the Sun, Mercury, Venus, Earth and Mars. The planets of the outer solar system are Jupiter, Saturn, Uranus and Neptune.
Here is your essay on Solar System! The Solar System is made up of all the planets that orbit our Sun. In addition to planets, the Solar System also consists of moons, comets, asteroids, minor planets, dust and gas. The inner solar system contains the Sun, Mercury, Venus, Earth and Mars.
- Hybrid Solar Lighting Introduction Hybrid Solar Lighting (HSL) is a type of lighting system that combines natural solar lighting with standard electrical lighting. This system . The Solar System consists of the Sun, the nine planets and their satellites; the comets, asteroids, meteoroids, and interplanetary dust and gas. It is composed of two systems, the inner solar system and the outer solar system. The inner solar system contains the Sun, Mercury, Venus, Earth and Mars.
Essay about Solar System and Jupiter Jupiter is the fifth planet from the Sun and by far the largest mass object in the solar system of all the other planets. Jupiter is twice the size of all the other planets combined. The Solar System My project is about the Solar System. The Solar System is made up of all the planets that orbits the Sun. The Solar System consists of moon, comets, asteroids, minor planets, dust and gas. Everything .