KWON O CHUL AstroPhotography

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History of the Universe

From Big Bang to the present, 13.8 billion years of Universe.

In the beginning, there was light.
13.8 billion years ago, the universe began from a small dot.
Packed inside this dot, was all the matter and energy that makes up our universe.

380,000 years after the big bang, the density of the universe became low enough to allow light to travel freely.

Hundreds of millions of years later, the first stars and galaxies began to form.
Smaller galaxies merge together to become larger galaxies. This is how our Milky Way formed.

Here in the outer region of our Milky Way, gas and dust clump together.
It's amongst this gas and dust that stars are born.
And when the central region of a star reaches 10 million degrees, nuclear fusion occurs.
4.6 billion years ago, our star, the Sun was born.

Orbiting our newly-born Sun, dust and rocks collided to form larger bodies, which became planets.

As the Earth formed, a Mars-sized object smashed into it.
The debris expelled from this collision, accumulated to form our moon.

Slowly the Earth cooled.
Oceans and continents emerged, and life began and evolved in various ways.

Finally humans appeared on Earth.
When these ancient people looked upward,
at the Sun, the Moon, the myriad of stars and the Milky Way;
what did they think about them?
It must have been a huge mystery.

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