Metaphysical Nihilism (or Blob Theory): This is the theory that there are no objects or that objects do not exist, and therefore empirical reality is an illusion, or, more commonly, the theory that there might have been no objects at all (i.e. that there is a possible world in which there are no objects at all).
Moral nihilism (also known as ethical nihilism or the error theory) is the meta-ethical view that nothing is morally right or wrong. Moral nihilism is distinct from moral relativism, which allows for actions wrong relative to a particular culture or individual.
Existential nihilism is the philosophical theory that life has no intrinsic meaning or value. With respect to the universe, existential nihilism suggests that a single human or even the entire human species is insignificant, without purpose and unlikely to change in the totality of existence.