Stars are formed from an enormous cloud of dust and gas in space.
In millions of light-years, the force of gravity continuously pulls these gases and dust together, leading to the formation of a ball-like object.
The majority of this gas is mainly hydrogen.
As more gas and dust is pulled into the object, it starts to spin.
As the object spins, the hydrogen atoms start to collide with one another. As a result of these collisions, the object's temperature starts to rise. This temperature rises continuously to over 10 million degrees Celsius. A chemical reaction called the nuclear fusion of the hydrogen atoms starts to take place. In this reaction, two atoms of hydron fuse or combine to form helium. After this reaction, the gas in the object starts to slow. At this stage, the object is called a protostar, and it is the first stage of star formation. The fusion that occurs is an exothermic reaction that gives off large amounts of heat.

After forming a star from a cloud of gas and dust called nebulae, the star remains in a period called the main sequence. This is where a star spends most of its life for millions of light-years.
A star depends...