Wednesday, 28 November 2012

Meteors 1. Meteoroids are small pieces of rock or metal floating in outer space. 2. When meteroids float near to the earth, they may be drown into the Earth's atmosphere due to gravity. 3.Meteroids which enter the Earth's atmosphere are called meteors. 4. Most meteors will burn up when they enter the Earth's atmosphere due to friction. 5. Thus, streaks of light can be seen in the sky at night in the dark. They leave behind fiery tails and are called shooting stars. 6. Meteors which do not burn completely and reach the Earth's surface are called meteorites. 7. Meteorites which fall to the ground will make huge craters. One crater is found in Arizona, the United States of America. 8. Many planets and their natural satellites are covered with meteorites craters. However the Earth does not many meteorite craters since it is protected by its atmosphere. ARIZONA CRATER

Friday, 9 November 2012


The story of Comet

1. Comets are small pieces of ice and dust that orbit around the Sun, but their paths are not like those of planets.

2. Most comets spend much their time out of the Solar System, beyond Pluto. However, they can enter new orbits that bring them into Solar System where they become visible from Earth.

3. The most famous comet is called Halley's comet which returns to the center of the Solar System every seventy-six years.

4.Halley's comet was last seen in early 1986. It will not seen again until 2061.

5.Halley was the first astronomer to show that some comets followed orbits that keep returning them to the vicinity of the Sun,

6.Every comet has a head an along tail. The small solid part at the center of the head called nucleus.

7. The nucleus contains ice and the heat of the Sun causes the ice to melt and give out gas and dust.

8. The gas and dust given out from the head of the comet forms the tail. The gas gives out light.

9. The tail of comet always points away from the Sun

                                                       Halley's Comet 1986

Natural Satellites

Natural satellites

Natural satellites are the natural objects which orbit around planets.
The moon is the Earth's only natural satellite.
All the planets in the Solar System have satellites except Mercury and Venus.
The number of natural satellite is shown  below
Mercury- 0 satellite
Venus- 0 satellite
Earth - i satellite
Mars- 2 satellites
Jupiter -16 satellites
Saturn - 21 satellites
Uranus - 15 satellites
Neptune - 8 satellites
Pluto - 1 satellite

Wednesday, 7 November 2012

Asteroids Belt


1. Besides the nine planets there are also and asteroid belt.
2. The asteroid belt lies between the orbits of Mara and Jupiter.
4. Asteroids are small pieces of rocks mixed with metals orbiting around the Sun.
5. Asteroids vary in size. Some can be as small as dust particles while some  can be a few hundred kilometers in diameters.

Sunday, 4 November 2012


1. Earth is the third planet from the Sun.
2. It is the fifth largest planet.
3. It is the only planet with oxygen and water. Thus, it is the only planet which living things can survive and grow.
4. Earth takes about 365 days to revolve around the Sun and rotates on its own axis  once every 24 hours.
5. Earth has a natural satellite (the Moon) revolving around it.

1. Mars is the fourth planet from the Sun.
2. It also known as the Red Planet because its surface is being covered with red dust.
3. Mars is a cold and lifeless planet.
4. One revolution of Mars around the Sun takes 687 days.

1. Jupiter is the largest planet in the Solar System.
2. It is the fifth planet from the Sun.
3. Most of Jupiter's volume is made up of gases and ice with only a small rocky core.
4. The atmosphere is composed of mainly hydrogen in gaseous and liquid forms together with helium, methane and ammonia.
5. Jupiter has sixteen natural satellites or moons and takes about 12 years to revolve once around the Sun.
6. Jupiter rotates so fast, once every ten hours, that it creates strong winds and great storms which persist over most of the planet.
7. Therefore, Jupiter is the planet which has the shortest day in the Solar System.

1. Saturn is the sixth planet from the Sun.
2. It is surrounded by a system of rings which make it most striking and beautiful planet when viewed through telescope.
3. Saturn is the second-largest planet in the Solar System.
4. However, it is lighter than a body of water of the same size.
5. Saturn is thought to have a small rocky high-temperature core surrounded by ice and ammonia, mixed with grit and gases.
6. The time for Saturn to revolve around the Sun is around 29 years.
7. Saturn rotates on its axis once every 10.7 hours.


1. Uranus is the seventh planet from the Sun in the Solar System.
2. This planet is blue because it has cold gases, mainly made up of hydrogen and helium.
3. Uranus also has a ring around it but the ring cannot be seen  clearly because it is too thin and dim.
4. T has five moons, and its rotates on its own axis slightly more slowly than Saturn.
5. The time taken for Uranus to revolves around the Sun is around 84 years.


1. Neptune, the eight planet from the Sun is almost the twin of Uranus.
2. It is a little heavier than Uranus and is very slightly bigger. It is bluish-green.
3. Neptune consists mainly of ice with some rock and gases, and has less atmosphere.
4. Neptune has two moons and takes about 165 years to revolve around the Sun.

1. Pluto is the ninth planets from the Sun.
2. It is smallest planet in the Solar System, and is made of rock and thin ice.
3. Pluto is a dark and cold planet. Its surface temperature can be as low as -230 degree Celsius.
4. This planet can be seen only through a telescope because it is so far away from Earth.
5. Pluto takes 247.7 years to revolve once around the Sun.

Saturday, 3 November 2012



1. Mercury is a closest planet to the sun
2. Since Mercury is closest to the sun its temperature can be over 300  degrees in the daytime
3. Mercury rotates on its axis very slowly , making one full rotation  every 59 Earth days.


1. Venus is the second planet from the sun
2. The size of venus is about the same as that of the Earth.
3. The planet is always covered by a very thick cloud of carbon dioxide and acid vapour.
4. Thus, the temperature of venus is extremely high, even though Venus is twice as far from Sun as Mercury and receives only a quarter as much light.
5. As  a result, the surface temperature can above 450 degrees
6. Venus takes about 225 days to revolve around the Sun
7. Venus rotates on its own axis once every 243 days.
8. Its gravity is the same as that of the Earth.