Deathbed cosmosis, interchangeably known as deathbed astrosis, is the belief or theory stating that those on their deathbed are more likely to achieve astrosis.

Decomposition is the central physical sign of the occurrence of cosmosis according the school of naturalism in Astronism and denotes a person becoming one with The Cosmos.

The destination of the unastronised refers to the question of the fate of a person who is not an adherent of Astronism, essentially a person who is a non-Astronist.

Destiny holds an important role and function within Astronism just as it does in other religions. The topic of destiny can be found in discussions across many disciplines of Astronism, but is mainly found in eschatology.

The topic of the end times, just like in any other religion, holds an important role in Astronism and is closely associated with the discussion of the future in Astronism (known as Astronist futurology).

Ephemeralism is a post-omnidoxical Astronist belief orientation regarding death and the nature of cosmic existence stating that all that exists within The Cosmos is transient and therefore prone to death due to the Cosmic Limitation Principle.

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The eschatology of Astronism is the collection of beliefs regarding death, the afterlife, and the destiny of the individual and of humanity that can be found within the Astronist religion. The eschatology of Astronism is divided across three schools listed in order of current popularity; the school of naturalism, the school of transcensionism, and the school of transtellationism.

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The Great Departation is a principal Astronist prophecy stating that spacefaring will lead to masses of humanity to leave The Earth for a life of spacefaring and space exploration.