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The solar system started as a gas cloud that moved around the galaxy and a star nearby exploded. The shockwave sent caused the gas to collapse and form the Sun.
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For the first hundred thousands of years, the dusts collided into each other called the 'primary accretion stage' -- continued for 10 million years
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Earth was formed about 4.6 billion years ago as a molten rock. It was formed and grew bigger by different materials (floating in space) colliding together.
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The materials from rocks melted and they were split into four layers: solid inner core, liquid outer core, mantle, crust. Heavier elements like iron became the core of earth and lighter elements like silicone rose and became the growing crust. The heat in the core also allowed activities of the earth such as spinning, breaking up the continents and creating tectonic plates
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A rocky planetoid about the size of Mars hit Earth and the part that broke apart cooled down and became the moon
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Some scientists believe that the existence of grains from zircon dates back to about 4.4 billion years ago
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First breathing of life emerged in rocks about 3.5 billion years ago (photosynthesis was one)
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750 million years ago, a triggering global chill happened called the ‘snowball earth’ (repeated for three times)
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Gas that was released from volcanoes formed the atmosphere and as the atmosphere became denser, clouds formed, and rain poured. The rain and asteroids that struck earth formed the ocean
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Roughly 650 million years ago, the first animals appeared
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The first hard parts on animals appeared 545 million years ago (many think that there was an extraordinary jump from a single cell to a complex creature)
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A mass extinction had happened in the Cambrian Period (545 million years ago) due to a huge asteroid that hit Earth but the biggest fossil record was in the Permian Period (252 million years ago). Chemical elements in old rocks also records that the mass extinction was due to climate change
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The first creature that looked very much like us now was called the 'Australopithecus Afarenis' which were mutated by the monkeys. They looked like monkeys but they could walk with two legs and use their arms. Slowly, as those humans adopted new techniques, they muted and became us, the 'homo sapiens'
