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4600 BCE
Sun forms
the solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula. -
4600 BCE
Planetary Accretion
The large dust cloud surrounding the newly born sun starts to clump with the help of gravity. The collisions of these clumps formed planets with immense amounts of heat. -
4500 BCE
Moon Formation
One theory of how the moon was formed is that a giant asteroid crashed into earth and it's debris started orbiting earth. Soon the debris from the collision clumped and formed the moon. -
Period: 4000 BCE to 3300 BCE
Planetary Cooling
The now relatively earth was beginning to cool. The Earth's surface — or crust — began to cool and stabilize, creating the solid surface with its rocky terrain. Clouds formed as the Earth began to cool, producing enormous volumes of rainwater from asteroids that formed the oceans. -
3900 BCE
Asteroid Showering Earth
A shower of asteroid brought water to earth and metal to earth. -
3700 BCE
End of Heavy bombardment
Asteroid showered earth for somewhere between 20-200million years. near 3.7 billion years ago the heavy bombardment has end.ed -
1000 BCE
Earth's core formed
Earth's liquid core formed long ago after earth started to cool and formed the crust and oceans covered earth. But earth's solid iron core that creates the magnetic field came much later. The exact time is still debatable but somewhere around 1.5b YA, the liquid iron churning at the heart of the planet froze and the cored formed. -
Continents
Earth's new crust grew rapidly, with about 70 percent of the crust formed by 3 billion years ago, researchers think. The earliest chemical markers of life also appeared with the first continents, about 3.8 billion years ago. -
Earliest Oxygen
Before photosynthesis evolved, Earth's atmosphere had no free oxygen (O2).[2] Photosynthetic prokaryotic organisms that produced O2 as a waste product lived long before the first build-up of free oxygen in the atmosphere,[3] perhaps as early as 3.5 billion years ago. -
Period: to
Photosynthesis
Photosynthesis developed in plants causing oxygen to slowly increase in the atmosphere. -
Earliest Life
The earliest form of life likely occurred around this time. -
Atmosphere and Ocean form
the discovery of the zircon grains in Australia provides compelling evidence that the atmosphere and ocean formed before 4.4 billion years ago. The early atmosphere likely began as a region of escaping hydrogen and helium.