Sunday, 4 December 2011
Solar System is located in the Milky Way galaxy, a barred spiral galaxy with a diameter of about 100,000 light years containing about 200 billion stars. The Solar System consists of the Sun and the other celestial objects gravitationally bound to it. Major features of the solar system means nine planets and their moons along with comets, asteroid and other space objects orbit the Sun. The Sun is in the center of the solar system.
1. The Sun
The Sun spin slowly on its axis as it revolves around the galaxy. The center,or core, of the Sun is very hot. A process called “NUCLEAR FUSION” takes place there. Nuclear fusion produces a lot energy. We call these storms “SUNSPORTS” because they looks like dark spots on the sun’s surface . The Sun also produces big explosions of energy called SOLAR FLARES .These flares shoot fast moving particles can hit the Earth’s atmosphere and cause a glow called an AURORA.
2. An Asteroid
An asteroid is a bit of rock. Most of the asteroids in our solar system can be found orbiting the Sun between the orbits of Mars and Jupiter. Asteroids can be a few feet to several hundred miles wide. This area is sometimes called the asteroid belt. Think about it this way: the asteroid belt is a big highway in a circle around the Sun. Asteroids as cars on the highway. Sometimes, the asteroid cars run into one another. When this happens, the asteroids may break up into smaller asteroids. Scientists think that most asteroids are the result of collisions between larger rocky space bodies. The belt probably contains at least 40,000 asteroids that are more than 0.5 miles across. If an asteroid is captured by the gravitational pull of a planet, the asteroid can be pulled out of the belt and go into orbit as a moon around the planet that pulled on it.
3. A Comet
A comet is made of dirty ice, dust, and gas. Scientists believe that about 100,000 million comets orbit the Sun. Scientists believe that comets are made up of material left over when the Sun and the planets were formed. Their orbits take them very close to and very far away from the Sun. Every time when a comet gets close to the Sun, a part of it melts. Over time, it will completely disappear. The solar winds then push the dust and gas released by the melting ice away from the comet. This forms the comet's tail. A comet does not give off any light of its own. What seems to be light from the comet is actually a reflection of the Sun's light.
4. The Moon
The Moon is Earth’s natural satellite. The Moon makes a complete orbit about the Earth with respect to the fixed stars about once every 27.3 days. Neil Armstrong became the first person to walk on the Moon as the commander of the American mission Apollo 11 by first setting foot on the Moon at 02:56 UTC on 21 July 1969.