The history of the visible universe dates back to the moment when light could circulate freely,
that is to say when our universe has cooled enough for photons to move
without colliding with other particles.
This moment occured 380,000 years after the Big Bang.
From this initial moment comes a very weakened light: the diffuse background or cosmological radiation.
The Big Bang
Here comes the light
Galaxies
The sun
The Moon
Planets
The first stars are estimated to have formed during the 200 million years following the Big Bang.
Galaxies appear during the first billion years after the Big Bang, such as our Milky Way.
The solar system is younger, having formed 4.6 billion years ago.
The Earth was created shortly after the sun, 4.53 billion years ago.
