2010年5月9日日曜日

4.Earth


Earth
Diameter: 12,756.28 km
Distance from the sun: 149,597,870 km
Period of rotation: 23 Hours 56.1 Min
Period of revolution: 1 Year, 0 Days, 0 Hours
Atmosphere: Mostly Nitrogen and Oxygen.
Temperatures:
Max – 50°C
Min – -70°C
Number and name of moons:
Number – 3
Names of moons - Moon
Earth is mostly iron, oxygen and silicon
If you could separate the Earth out into piles of material, you'd get 32.1 % iron, 30.1% oxygen, 15.1% silicon, and 13.9% magnesium. Of course, most of this iron is actually down at the core of the Earth. If you could actually get down and sample the core, it would be 88% iron. 47% of the Earth's crust consists of oxygen.

Earth doesn't take 24 hours to rotate on its axis
It's actually 23 hours, 56 minutes and 4 seconds. This is the amount of time it takes for the Earth to completely rotate around its axis; astronomers call this a sidereal day.

5.Mars


Mars
Diameter: 6,792km
Distance from the sun: 227,939,100 km
Period of rotation: 24 hours, 37' 23''
Period of revolution: 687 days
Atmosphere: Mars has a very thin atmosphere made mostly of carbon dioxide. The atmospheric pressure on Mars changes seasonally because the temperature is cold enough that some of the carbon dioxide freezes during the winter and "snows" onto the polar cap.
Temperature:
Max – 36 degrees C
Man - -123 degrees C
Number and name of moons:
Number – 4
Name of moons – Phobos
Deimos
Interesting facts!
1. Mars is seventh largest planet in our solar system.
2. Mars is named after roman god of war.

6.Jupiter


Jupiter
Diameter: 142, 984 km
Distance from the sun: 778570000 km
Period of rotation: 9.8 hours
Period of revolution: 12 years
Atmosphere: The atmosphere is the largest in the solar system and is mainly composed of hydrogen and helium.


Temperature:
Max – -148.15 celsius
Min - -223.15 celsius
Number and name of moons: Number – 5
Name of moons – Adrastea , Aitne , Amalthea ,Ananke
Interesting facts1. Jupiter is the fastest spinner in our solar system - For all its size and mass, Jupiter sure moves quickly. In fact, the planet only takes about 10 hours to complete a full rotation on its axis.
2. The Clouds on Jupiter are only 50 km thick

7.Saturn


Saturn
Diameter: 120,536 km

Distance from the sun: 1.4 billion km

Period of rotation: 10 hours 32 - 47 minutes.


Period of revolution: 29.5 years

Atmosphere: 75% hydrogen and 25% helium

Temperature: Max – -130° celsius
Min – -191° celsius
Number and name of moons:
Number – 6
Name of moons – Aegaeon, Aeqir, Albiorix, Anthe .
Interesting facts!
1. Saturn is the second largest planet in the Solar System
2. The first astronomers thought the rings were moons

8.Uranus


Uranus
Diameter: 51,118 kilometers
Distance from the sun: 2872.5 * 106 kilometers
Period of rotation: 17.2 hours
Period of revolution: 30,589 days
Atmosphere: Mainly of molecular hydrogen and helium.
Temperature:
Max – -200°C
Min –-214°C

Number and name of moons:
Number – 7
Name of moons –Cordelia, Ophelia, Bianca, Cressida

Interesting facts1. Uranus is the coldest planet in the Solar System
2. Uranus has rings( very dark )

9.neptune


Neptune
Diameter: 49,528 km

Distance from the sun:
4,503,443,661 km

Period of rotation: 18 hours

Period of revolution: 8 years

Atmosphere: mainly of hydrogen, with a small percentage of helium and a smaller percentage of methane.

Temperature:
Max – -220 Degrees Celsius
Min –-223 Degrees Celsius
Number and name of moons:
Number – 8
Name of moons – Naiad, Thalassa, Despina, and Galatea
Interesting facts
1. Neptune's surface gravity is almost like Earth.
2. Neptune has the strongest winds in the Solar