The most common star known is our sun, this is well known, but where does the sun come from? It cannot have appeared out of nowhere and cannot remain forever, because every birth corresponds to a death. Astronomers believe that molecular clouds, or large clouds of gas, are the primary source of star birth. Gravity compresses this cloud into a huge sphere of gas and dust, and once the temperature reaches 15 million degrees it triggers nuclear fusion, starts to glow and burn, and voila! A new star is born! But how does nuclear fusion begin? Well, remember all this gas and dust at the center of mass? Well, as the temperature increases, the pressure also increases, and the electrons separate from the atoms, creating plasma. The increased heat causes the plasmas to move so fast that they collide with each other and fuse, and in doing so they release a large amount of energy that filters out of the core and becomes electromagnetic radiation once it reaches the outer layers of the mass of gas and dust that causes the glow. Voila! A new star is born! But that's not all ...