Stars

Constellation:

A constellation is a group of stars that have formed a pattern, in which this is where they get there names from.

Black-Hole

is a region of space time from which gravity prevents anything, including light, from escaping. Don't let the name fool you it is the opposite of empty. Rather, it is a great amount of matter packed into a a very small area.

Supernova

Once a star blows up it isn't actually a star, its a supernova. A supernova gets all its energy from gravity. Supernova's can briefly outshine entire galaxies and radiate more energy than our sun will in its entire lifetime. They're also a primary source of heavy elements in our universe.

White Dwarf

A White Dwarf is what stars like the Sun become after they have exhausted their nuclear fuel. At the end of its nuclear burning stage, this type of star expels most of its outer material, creating a planetary nebula. Only the hot core of the star is left. This core becomes very hot white dwarf.