Our solar system condensed from a swirling cloud of dust and gas in one of the arms of a spiral galaxy called The Milky Way about 15,000 years ago.
The sun has 3 outer layers we can see.
We cannot see into the core but its temperatue is thought to be 14 million degrees celcius.
In the increedible heat and pressure, atoms of hydrogen are brought together and fused into a diferent gas called helium.
During a total solar eclipse, the tip of the moon's shadow reaches the earth's surface.
There have been many theories about how and when the universe began but scientists now believe it was 20,000 million years ago!