There are many types of stars ranging from the very
small and dense, to the very large and hot. All have different properties
as well and are categorized into four main groups: dwarfs, giants,
binary stars and neutron stars. Dwarf stars are classified in four
groups: red, yellow, white and brown dwarfs. Red dwarfs are small,
somewhat cool stars; yellow dwarfs are relatively small and not
very hot, like our sun. These stars are very common throughout our
universe. White dwarfs are small, very hot and very dense stars;
their sizes are close to that of Earth. White dwarfs are mainly
composed of carbon and are the remnants of a Red Giant that has
lost its outer layers during the final stages of its life. Brown
dwarfs are stars that do not have enough mass to continue nuclear
fusion within the core.
There are three main categories of
giants: red, blue and super-giants. A red giant is a star that has
expanded from its original size in the last stages of its life.
They become cooler and are usually orange in color. Blue giants
are also very large and very massive, but unlike red giants, they
are very hot as well. Super-giants are extremely large stars, sometimes
the size of our solar system. These stars are rare in the universe
and they die in the form of a cataclysmic explosion called a supernova
and result in the formation of a black hole.