The ultimate and final form of perfect mind in the universe, and most rarified, is in the living beings that inhabit such planets as the Earth. Early Western philosophers liked to postulate that reality consisted of five elements instead of four. Besides earth, air, fire, and water, there was a fifth essence they called the aether. Mind had to be made of something if it was to be explained at all. If there is life after death, then there must be a spiritual world for soul to experience its existence.
Calculations show that it makes up ninty to ninty-nine percent of the mass of the universe.
It must exist to explain galactic rotation and formation in a universe that began with a Big Bang. The traditional view of our Milky Way galaxy is of a central bulge of many old stars within a thin disc of young stars about 100,000 light-years long. Now evidence suggests that the galaxy is enveloped by a huge sphere of dark matter greater than 300,000 light-years across. This means that about eighty percent of our galaxy cannot be seen. Other galaxies spin so fast that were it not for the weight of some unseen mass they would fly apart.