Solar System: The Definition, Sun, Planets and Other Celestial Objects
At night, when you see a very sunny sky, try you saw and looked at the sky. And what you see in the sky? Yes, of course you must see the stars scattered and sometimes you see the moonlight. The moon and stars are celestial objects. Now I will discuss the understanding of the solar system. The solar system is a collection of heavenly bodies consisting of a star called the Sun and all the objects that are bound by the force of gravity.
Our solar system consists of the Sun, the planets and all space objects circulating around it. The planets that make up our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and the last one is Pluto. While other celestial objects, namely: satellite, meteoroids, asteroids and comets. For more details, let me discuss one by one.
Sun and Other Celestial Objects
Around the sun there are nine planets, but astronomers said there were eight of celestial bodies. The sky objects called planetary. The planet around the sun at a particular track. An eighth planet circling the sun, namely Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
The sun is the center of our Solar System. Has a diameter of about 1.392.500 km. The sun is composed of 70% hydrogen and 25% helium and 5% other gases. The distance between the sun to the earth is about 150.000.000 km. The outside temperature is approximately 60,000 Celsius. The parts of the sun include: photosphere, chromosphere, prominence, corona, sunspots.
The planets are in the solar system / around the sun:
Planets are celestial bodies that do not have their own light. Planet simply reflect the starlight. For example the sun. The movement of planets around the sun is called rotation. Until now the number of planets that we already know there are eight planets, namely:
Mercury is the closest planet to the sun. Kaloris is the largest crater on the planet. The planet is called the morning star or the evening star. Circulation time of 88 days, the distance to the sun about 58,000,000 km.
Venus is the closest planet to the Earth. This planet is called a white planet, or the morning star. The distance between Venus to the sun is about 108,000,000 km, The temperature reaches 5,000 Celsius.
Earth is the only planet that can be occupied by all living things. The distance of Earth to the Sun approximately 150 million km. The time of revolution is 365.25 days or 1 year was when the rotation is 24 hours or one day. Earth has one satellite named months.
Mars is known as the red planet. The time of revolution is 687 days when the rotation was 24.6 hours. The highest temperature on its surface is 500-600 Celsius. This planet has two satellites namelyPhobos and Deimos. The distance from the Sun is 1.52 SA.
Jupiter is the largest planet in the Solar System. The rotation time is 50 hours, the distance to the Sun is 778 million km and has 17 satellites. This planet is often called a gas planet.
Saturn is the second largest and has 22 satellites. The distance to the Sun about 1433.5 million km (9.5 AU). The revolution time is 29.5 years and 10.7-hour rotation period.
The rotation time is 17.2 hours, and the time of revolution is 84 years. Uranus has 15 satellites.
Neptune often called twin planets because it has two satellites, Triton and Neroid. The time of revolution is 164.8 years and when the rotation is 16.1 hours.
Of the eight planets, the solar system experts classify it into two parts:
1. Inner Planets
The basis of this classification there are 2 kinds as well, namely:
- Seen from Earth orbit, the inner planets which Mercury and Venus
- Judging from the existence of the asteroid, the inner planets which Mercury, Venus, Earth and Mars.
2. Outer Planets
Which includes the outer planets are planets that are not included in the inner planets, Jupiter, Saturn, Uranus, Neptune.
Other Celestial Objects:
Besides the planets that have been discussed are, in the solar system there are also other celestial objects that are members of the Solar System. These objects have a different trajectory to the planet. Here I will discuss one by one.
Satellites are celestial bodies that accompany the planet for around the sun. Satellites can be divided into two kinds, namely:
- Natural satellites are satellites that already exist in the Solar System without created by Man. Example: Month
- Artificial satellites are satellites made by humans and launched using a rocket with a specific purpose. Example: Envisat.
A meteoroid is a small celestial objects floating in space, or commonly called a shooting star. Meteoroids that are too close to the Earth could be affected by the gravitational forces of Earth so that entry into the Earth. Meteoroid will rub against the Earth’s atmosphere, causing sparks. These sparks of light we call a meteor or shooting star.
Comets are incandescent bulb that has a tail light, so it is often called a comet. Comets appear in the Solar System and can be seen in the future is not certain. The most famous comet is Halley’s Comet appears every 76 years.
Asteroids are celestial objects smaller that around the Sun at a specific track. Most asteroids have a circulation path between the circulation path of Mars and Jupiter. The trajectory of an asteroid named Asteroid Belt. Some asteroids are known, among others:
- Ceres with a diameter of 975 Km
- Juno with a diameter of 265 Km
- Vesta with a diameter of 530 Km
- Pallas with a diameter of 535 Km.
Below are some other pictures of solar system: