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The Solar System was created in a very interesting way. The scientists believe that there was a fusion reaction that was created due to an explosion and the particle matters were sent out widely into the space. Nearly about 4.5 billion years ago, the protosun was collapsing under its own gravitational force. |
Because of the immense level of compression experienced due to the gravity the center of the protosun condensed and excessive hydrogen started burning. Eventually it became a big ball of burning fire and that is what we call the sun today. The other huge masses that were created due to the explosion were scattered around the sun. The sun still had a tremendous gravitational force. These particles were clearly divided into solids and gases.
The solids started collecting together and started forming huge masses in the space.
Eventually they just formed solid masses and the gases collected together and started forming gas bodies. So among the nine planets that exist in our Solar System, leaving out the sun, four of them were solid planets and the other four of them were gas planets.
The planets revolved around the sun and that is one of the main criteria to qualify as a planet. The solid planets are Earth, Mars, Venus and Jupiter. The gas planets were Uranus, Pluto, Neptune and Saturn. Today, the scientists argue that Pluto cannot be qualified as a planet because it has a tendency to move away form its orbit. For being a planet, it should revolve in its own orbit and also around the sun. The sun's and the planets' gravitational force actually keep the planets revolving around the sun. The planets are trying to get away form the sun due to their gravitational force and the sun keep pulling them together back towards itself.
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