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- 4.6 Billion Years Ago
- In a wispy cloud of gas and dust, somehow part of the cloud collapsed in on itself caused it to compress.Trong một đám mây mù mịt khí và bụi, bằng cách nào đó, một phần của đám mây tự sụp xuống khiến nó bị nén lại.
- Our sun was born when enough material collected at this disk's center. It collecting up all of the materials by strong gravity.
- CRASH*
- The material left behind by the sun crashed each other into bigger and bigger pieces. It is called planetesimal which is a reason why there are planets, asteroid, comets, and moons.
- After a million years later, these rocky pieces become solid and starting to orbiting around the sun.
- Since there are rocky planets nearby the sun, gaseous and icy material collected further away which is called a gas giant planet. These gas giant planets are bigger than terrestrial planets and very far from the sun.
- Only terrestrial planets could survive close to the sun. These planets are made of silicate rocks or metals which are Mercury, Venus, Earth, and Mars.
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