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5000 BCE
Sun Formation
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. -
4900 BCE
Primary Accretion Stage
For the first hundred thousands of years, the dusts collided into each other called the 'primary accretion stage' -- continued for 10 million years -
4600 BCE
Earth Formation
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. -
4550 BCE
4 Layers of Earth
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 -
4500 BCE
Formation of Moon
A rocky planetoid about the size of Mars hit Earth and the part that broke apart cooled down and became the moon -
4400 BCE
Zircon Grains
Some scientists believe that the existence of grains from zircon dates back to about 4.4 billion years ago -
3500 BCE
Breathing of Life
First breathing of life emerged in rocks about 3.5 billion years ago (photosynthesis was one) -
750 BCE
Snowball Earth
750 million years ago, a triggering global chill happened called the ‘snowball earth’ (repeated for three times) -
700 BCE
Ocean Formation
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 -
650 BCE
First Animal
Roughly 650 million years ago, the first animals appeared -
545 BCE
First Actual Animal
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) -
252 BCE
Mass Extinction
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 -
55 BCE
Human Evolution
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'
