Critical+Vocabulary

__Critical Vocabulary__

 * __**Giant**__ = a star past the main sequence
 * **__Apparent Magnitude__** = the brightness of a star as it looks from Earth
 * **__Absolute Magnitude__** = a star's brightness
 * **__Super Giant__** = A Giant, but bigger
 * **__Supernova__** = a giant explosion that results in either a black hole or a pulsar
 * **__Dwarfs__** = small stars that burn hydrogen much slower than giants or medium-sized stars
 * **__Protostar__** = a star before it is developed
 * **__Neutron Star (pulsar)__** = a small extremely dense star that is the result of supernova.
 * **__Fusion__** = the action of atoms bonding to create new atoms
 * **__Main__ __Sequence__** = the main life of a star, when it is average-sized and has a good amount of hydrogen left
 * **__Nebula__** = a space cloud of particles and gases
 * **__Galaxy__** = an area of stars, solar systems, and other objects, held together by gravity
 * **__Black__ __Hole__** = an object in space so dense that its escape velocity exceeds the speed of light.
 * **__Luminosity__** = the brightness of a star in comparison to the sun
 * **__Hertzsprung Russell__ __Diagram__** = a graph which compares stars to one another
 * **__Scientific__** __**Theory**__ = a theory that has facts to help back it up
 * __**The** **Big** **Bang** **Theory**__ = the theory that all the matter and energy of the universe was held at one point, and there was a giant explosion that sent all the matter outward.