Discover Solar System – Part 2

For thousands of years humans were unaware of the Solar System and believed that Earth was at the center of the Universe.

The Babylonians and others of long ago thought Earth was just as it looks—flat. Astronomers such as Nicolaus Copernicus, Galileo Galilei, Johannes Kepler and Isaac Newton helped develop a new model that explained the movement of the planets with the Sun at the center of the Solar System.

The Voyager 1 spacecraft is the furthest man-made object in the solar system, it is around 11 billion miles (18 billion km) from the sun and is still sending data back to Earth.


  • Jupiter is the largest planet in the Solar system, with a mass more than 300 times the mass of the Earth and is called after the ancient Roman sky-god, Jupiter, known to the Greeks as Zeus.
  • At the center of Jupiter is a rocky core, bigger than Earth but weighing about 20 times more.
  • Surrounding the core is an ocean of liquid hydrogen with 1000 kilometers deep.
  • Jupiter is the stormiest planet in the Solar System. There is a big red spot which is the largest hurricane in our Solar System. It’s been raging for over three hundred years.

Here is an example of the sky of Jupiter from artist view:



  • Saturn is the sixth planet in the Solar system and the most beautiful.
  • Saturn also has a small rocky core covered with liquid gas.
  • Saturn is surrounded by a system of rings that stretch out into space for thousands of kilometers. It has at least 18 moons and satellites.
  • Saturn is very light because it is made up of hydrogen. However, it is not peaceful planet because storms winds race around the atmosphere at 800 km/h.



  • We can not see Uranus from Earth without telescope
  • Uranus is also made up by gas. Most of the center of Uranus is a frozen mass of ammonia and methane, which gives it the blue-green color.  The atmosphere also contains hydrogen and helium.
  • Uranus takes 84 years to complete one orbit.
  • Scientist believe that under the hydrogen-methane atmosphere is a hot, slushy ocean of water, ammonia, and methane thousands of miles deep wrapped around a rocky core.




  • Neptune is a large planet, nearly four times the size of Earth.
  • Neptune is one of the four “gas giants”.  Like Jupiter, Saturn and Uranus, it is composed only of gas.  Neptune is a great ball of hydrogen and helium.
  • In 2011 it finally made it’s first lap around the sun since we discovered it. One Neptune year lasts 165 Earth years.
  • Like Jupiter, Neptune has a dark spot caused by a storm.  Neptune’s spot is smaller than Jupiter’s — it is only about the size of the planet earth.