Diameter (km): 1 392 000 which is about 109 times the size of earth

Composition: Gas

Number of satellites: 9

Temperature: 5,505 °C

Length of average year: 225 million earth years (1 cosmic year)

Atmosphere: Chromospheres, photosphere, transition region, corona and heliosphere

Point of interest: The sun is around 4 billion years old and is expected to live for another 4 billion years

Diameter of each planet (km): 4 878

Distance from sun (km): 58,343,169.6

Composition: Rock

Number of satellites: None

Temperature: -180 to 430 °C

Discovery date: Prehistory

Length of average day: 176 Earth Days

Length of average year: 88 Earth days

Type of atmosphere: None

Point of interest: The Hubble telescope can’t look at Mercury because it is too close to the sun

Diameter of each planet (km): 12 104Distance from sun (km): 107,710,466.9 Composition: It is estimated to be similar to Earths Number of satellites: None Temperature: 465°C Discovery date: PrehistoryLength of average day: 243 Earth days Length of average year: 225 Earth days Type of atmosphere: CO2

Point of interest: Venus is Earths twin. They have similar size, mass and orbits around the sun

Diameter of each planet (km): 12 756

Distance from sun (km): 149 597 870.7Composition: Inner core, outer core, magma and crustNumber of satellites: oneTemperature: -89 to 58ºCDiscovery date: Earth wasn't discovered by anyone Length of average day: 24 hours Length of average year: 365 Earth days and in a leap year 336 earth days Type of atmosphere: N2+O2

Point of interest: Earth is the only known planet to have life on it

Diameter of each planet (km): 6 787

Distance from sun (km): 16 006 972.2

Composition: Rock and Iron

Number of satellites: 2

Temperature: -82 to 0ºC

Discovery date: Prehistory

Length of average day: 1.03 earth days

Length of average year: 1.88 earth days

Type of atmosphere: CO2

Point of interest: Mars has a grand canyon that is around the size of one side of America to the other

How are asteroids formed: Asteroids were formed in the big bang and were remains that couldn't form a planet or anything else Number of asteroids: ThousandsDistance from sun (km): 402 336 000Composition: Rock and metalNumber of satellites: Thousands Temperature: Roughly-73ºC Discovery date: 1700's and 1800'sPoint of interest: Most asteroids are covered in dust

Diameter of each planet (km): 142 800

Distance from sun (km): 777 908 927.6

Composition: Gas

Number of satellites: 60

Temperature: -150 °C

Discovery date: Prehistory

Length of average day: 0.41 Earth days

Length of average year: 11.86 earth years

Type of atmosphere: H2+He

Point of interest: Jupiter has clouds which are 50km thick

Diameter of each planet (km): 120 000Distance from sun (km): 1 427 163 686.4Composition: GasNumber of satellites: 31 Temperature: -170ºCDiscovery date: Prehistory Length of average day: 0.44 earth days Length of average year: 29.46Type of atmosphere: H2+HePoint of interest: There could be life on one of Saturn's moons

Diameter of each planet (km): 51 118 Distance from sun (km): 2 869 287 159.8Composition: GasNumber of satellites: 27Temperature: -200ºCDiscovery date: 1781Length of average day: 0.72 earth daysLength of average year: 84.01 earth daysType of atmosphere: H2+HePoint of interest: Uranus was the first planet discovered in the modern age

Diameter of each planet (km): 49 528Distance from sun (km): 4 496 911 993Composition: GasNumber of satellites: 13 Temperature: -210ºCDiscovery date: 1846Length of average day: 0.72 earth daysLength of average year: 164.8 earth yearsType of atmosphere: H2+HePoint of interest: Neptune has the strongest winds in the solar system. They can reach up to 2100km/hour

Diameter of each planet (km): 2 300Distance from sun (km): 5 900 140 020Composition: RockNumber of satellites: 1Temperature: -220ºCDiscovery date: 1930Length of average day: 6.38 Earth daysLength of average year: 247.7 Earth yearsType of atmosphere: CH4

Point of interest: If it were closer to the Sun, Pluto would be a comet

How are comets formed: Comets were formed in the Big Bang. The core heated up but not enough to melt the ice on top.

Where do they come from: Comets come from the Oort cloud and the Kuiper Belt

What is the tail of a comet: The tail of a comet is the melted off dust and gas from the comet when it gets close enough to the sun.

Discovery date: 2500BC

Some Famous comets: Halley's comet, Hyakutake, Hale-Bopp

The inner planets are the four closest planets to the sun. They are Mercury, Venus, Earth and Mars.

The inner planets are mostly made of rock and are generally smaller and denser than the outer planets.

They also have less moons than the outer planets and don’t have any rings around them either.

The outer planets are Jupiter, Saturn, Uranus, Neptune and Pluto. They are also known as the gas giants.

They are known to have more moons than the inner planets and some have rings made out of ice and rock.

The inner and outer planets are divided by the asteroid belt.

• What it is: The Oort cloud is a circular region of comets that surrounds the solar system out to more than 1,000 times the distance between Pluto and the sun.

• Formation: It was formed in 0001BC. It is believed that the objects in it were once close to the sun but were then pulled away by the planets gravity

• Location in Solar System: It is found past Pluto. It may even extend to the end of the universe

• Items found in it: Comets and other small individual things

• Point of interest: The Oort cloud is the farthest from the sun that is still in the solar system