2. The Sun 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
3. Mercury 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
4. Venus Diameter of each planet (km): 12 104 Distance 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: Prehistory Length of average day: 243 Earth days Length of average year: 225 Earth days Type of atmosphere: CO 2 Point of interest: Venus is Earths twin. They have similar size, mass and orbits around the sun
5. Earth Diameter of each planet (km): 12 756 Distance from sun (km): 149 597 870.7 Composition : Inner core, outer core, magma and crust Number of satellites: one Temperature: -89 to 58 ºC Discovery date: Earth wasn't disco vered 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: N 2 +O 2 Point of interest: Earth is the only known planet to have life on it
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7. Asteroid Belt 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: Thousands Distance from sun (km): 402 336 000 Composition : Rock and metal Number of satellites: Thousands Temperature: Roughly -73 ºC Discovery date: 1700's and 1800's Point of interest: Most asteroids are covered in dust
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9. Saturn Diameter of each planet (km): 120 000 Distance from sun (km): 1 427 163 686.4 Composition : Gas Number of satellites: 31 Temperature: -170ºC Discovery date: Prehistory Length of average day: 0.44 earth days Length of average year: 29.46 Type of atmosphere: H 2 +He Point of interest: There could be life on one of Saturn's moons
10. Uranus Diameter of each planet (km): 51 118 Distance from sun (km): 2 869 287 159.8 Composition : Gas Number of satellites: 27 Temperature: -200ºC Discovery date: 1781 Length of average day: 0.72 earth days Length of average year: 84.01 earth days Type of atmosphere: H 2 +He Point of interest: Uranus was the first planet discovered in the modern age
11. Neptune Diameter of each planet (km): 49 528 Distance from sun (km): 4 496 911 993 Composition : Gas Number of satellites: 13 Temperature: -210ºC Discovery date: 1846 Length of average day: 0.72 earth days Length of average year: 164.8 earth years Type of atmosphere: H2+He Point of interest: Neptune has the strongest winds in the solar system. They can reach up to 2100km/hour
12. Pluto Diameter of each planet (km): 2 300 Distance from sun (km): 5 900 140 020 Composition : Rock Number of satellites: 1 Temperature: -220ºC Discovery date: 1930 Length of average day: 6.38 Earth days Length of average year: 247.7 Earth years Type of atmosphere: CH 4 Point of interest: If it were closer to the Sun, Pluto would be a comet
