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Asked by cook333 to Alex, Anaïs, Peter, Sarwat, Shreesha on 11 Mar 2015. This question was also asked by sir luke neeeenaaaan.
Question: how did the earth actually become what it is today?
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Anaïs Pujol answered on 11 Mar 2015:
From debris from dead stars which accumulate to form a molecular cloud composed of gas and particles. This cloud will contract on itself which will increase its temperature and the sun will be created. Others heavier element will aggregate together to form planets. At the beginning there were 20 planets and earth was one of them, but the planets combined by shock and 9 planets reminded. Physicist think it is at this time the moon was created after a collision between earth and a mass as big as Mars. Also at the beginning the temperature on earth was 5 000°C . Little by little the temperature got down and water came to earth and then oxygen.
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Sarwat Iqbal answered on 12 Mar 2015:
Scientists have proposed that several billion years ago our solar System was a cloud of cold dust particles swirling through empty space. This cloud of gas and dust was disturbed, by the explosion of a nearby star, and the cloud of gas and dust started to collapse as gravity pulled everything together, forming a solar nebula — a huge spinning disk. As it spun, the disk separated into rings and the furious motion made the particles white-hot.
The center of the disk became the Sun, and the particles in the outer rings turned into large fiery balls of gas and molten-liquid that cooled and condensed to a solid form. About 4.5 billion years ago, they began to turn into the planets that we know today as Earth, Mars, Venus, Mercury, and the other planets. -
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