A. Nebula - a cloud of gas and dust in outer space.
B. Protostar - a contracting mass of gas which represents an early stage in the formation of a star.
C. Red Giant - a very large star of high luminosity and low surface temperature.
D. White Dwarf - a small very dense star that is typically the size of a planet.
E. Red Super Giant - an extremely large red giant star with a minimum of 15 solar masses.
F. Supernova - a powerful and luminous stellar explosion.
G. Neutron Star - the collapsed core of a massive supergiant star.
H. Black Hole - a region of a selective where gravity is so strong that noting-no particles or even electromagnetic radiation such as light—can escape from it.