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Supergiant Star
Supergiants are believed to be the largest stars in the universe. These massive stars are many times the size of Earth's sun, consuming hydrogen at such a high rate that they burn out after a few million years of life. Supergiants eventually explode in a supernova.
Neutron Star
The core of a neutron star is composed entirely of neutrons. These stars are initially twice the mass of the sun but have been destroyed in a supernova explosion. If a star that has gone supernova is particularly huge, it may transform into a black hole.
Protostar
Protostars indicate the earliest stages of star formation. Over 100,000 years, gravity applies pressure and condenses the gasses in a molecular cloud, with the result being a star.
T Tauri Star
A T Tauri star is in something of an adolescent stage. The T Tauri has progressed past the protostar period and spends approximately 100 million years gaining enough pressure and heat at its core to instigate nuclear fusion. T Tauris are known for their solar winds and X-ray spikes.
Main Sequence Star
Main sequence stars are what people see when they look into the night sky. These stars spend billions of years turning hydrogen into helium and give off nearly immeasurable amounts of energy and heat. Earth's sun is a main sequence star.
White Dwarf Star
A white dwarf is a star that has burned through all of its hydrogen fuel. Over 100 billion years, this type of star will eventually cool down, its own gravity causing it to collapse inward upon its core.
Red Giant Star
Red giants are stars that are in preparation to become white dwarfs. The red giant has used up all the hydrogen inside its core, however, a shell of hydrogen surrounding the core is still burning. A red giant eventually consumes any metal or gas that is ignitable, expanding to over 100 times the mass it held during its existence as a main sequence star.
Red Dwarf Star
Red dwarfs are conservationists. These stars, the most common in the universe, have a low mass and are relatively cool. Red dwarfs burn their hydrogen at a very slow rate and may live as long as 10 trillion years.
Yellow Dwarf Star
Earth's sun is a main sequence star, but it is also classified as a yellow dwarf. A yellow dwarf is a comparitively small star that fuses hydrogen into helium to create light. Yellow dwarfs exist for approximately 10 billion years, after which they will transform into red giants. When all possible fuel has been burned, the red giant will collapse into itself and become a white dwarf.