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Well All a Star is, is a ball of hot gases which gives out two types of energy. Light and Heat. Simple

there are three types of stars; Red Dwafs, White Dawfs and Neutron stars.

The Gravitational energy is transferred into heat energy, until thermonuclear fusion reactions start at the hot centre of the proto-star. The fusion reactions start at a temperature of about 15 million°C and convert hydrogen into helium. This releases energy and stops the star shrinking any more. The star then has a long period of a normal life.

In other words a star is born when a big group of hydrogen atoms are squashed together and forms a new atoms called Helium. The helium atoms is the fuel for the proto-star and it then emits heat and light turning it into a star!

The end of the star depends on the mass of the star. what happens when a mendium-weight star, like our sun starts to run out of hydrogen fuel? its becomes unstable, swelling up to form a Red Giant as it converts helium into carbon. it will then cool down and shrink to form a White Dwaf.

But dont worry! The sun still has enough fuel to last it another 5 Billion years! Way after our lifetimes!

Before a star dies it ejects a lot of gas and dust. This is called Planetary Nebula. This is also what new stars are formed from.

If The star a heavy-weight star, it will fill first swell into a red giant before it explodes as a supernova!

If the star is big enough the explostion will leave a neutron star or a black hole. A black hole is an object where its mass is so large and its gravity is so strong that not even light can escape from it!