A Stars Life Cycle
by: Aidan O'Bannion
A nebula is a cloud in outer space that is made of dust, hydrogen, helium gas, and plasma. It is formed when portions of the interstellar medium collapse and combine due to gravity that pulls together the particles that make up a nebula.
The protostar is formed when protons inside of the nebula crash together forming another proton. Eventually the star will be big enough to have its own gravitational pull.
A white dwarf is a small very dense star that can be about the size of a planet. A star turn into a white dwarf from a red giant after there is no more nuclear fuel in its core.