This is but a small cluster of Galaxies - one of many thousands of similar clusters. Way - is but a speck of light in a group like this. Remember we said that in the vast emptiness of the Universe even a group of galaxies like this is a rare find. The English Astronomer James Jeans also said that if you were to put 3 grains of sand in a large Cathedral, it would be more closely packed with sand than the Universe is packed with stars. The closest star to Earth is our own sun.
All stars are in gaseous form - balls of helium and hydrogen plus other elements.
A star's energy source lies in its core and every second millions of tons of hydrogen is fused to form helium. They are young and healthy - like our sun. They are also called dwarfs. Although they are called dwarfs, some of them are 20 x larger and 20,000 times brighter than our sun. They are the most common of all and are coming to the end of their lives.