The Universe


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  • 13.8 billion years ago, there was a big explosion. Scientist believe this explosion started our universe. The wreckage from the explosion then crashed into a cloud of gas, bringing together the ingredients for our solar system. This explosion was the Big Bang .
  • Gradually,bits of dust began to cluster, making bigger lumps and the mixture together under it's own gravity. Eventually, the middle cluster became so hot that it generated its own energy, igniting nuclear energy. This was the birth of our Sun.
  • Over millions of years, the dust clustered into lumps, then boulders, and finally planetesimals- chunks of rock big enough to have their own gravitational field. Some of those planetesimals became embryonic forms of our planets today.
  • Slowly, these rocky planets began to organise themselves in their owndistance from the Sun, finding their own orbit. Earth found it's own path as the third planet from the Sun. In the early days, rock pile-ups were common and left craters on the surface of all the planets. One of the collisions, 4.5b years ago, is thought to have nearly destroyed the Earth and was probably responsible for our moon.
  • A large planetesimal, about the size of Mars, gave Earth a glancing blow, throwing a chunk of the Earth's crust into space. Some of the planetesimal joined Earth while the ejected lump started it's own orbit around the Earth and became our Moon.
  • When Earth was first formed, it was very different from the Earth we have today.There weren't any oceans or continents. Meteorite collision ect. made Earth hotter. After millions of years, the Earth's temperature reached 2,000C and the Earth's core formed. At this point, much of the Earth was molten and there could have been a magma ocean too. Gradually, the Earth cooled and settled into a core, mantle, and crust. This triggered plate tectonics and make the Earth more like today's.
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