Cosmosis, also known as cosmic union, cosmic reunion, cosmic unity, cosmic enlightenment, cosmic unionisation or cosmic oneness, and often colloquially referred to as "becoming One with The Cosmos", and technically referred to as post-corporeal cosmosis, in Cosmic alchemy and in Astronic eschatology and thanatology, is a principal belief in Astronism stating that union with The Cosmos is the ultimate destiny of all composite entities and beings residing within The Cosmos. 

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This form of cosmosis may also be known as standard cosmosis in contrast to astrosis, or corporeal cosmosis, which refers to the achievement of cosmosis during one's lifetime. This is achievable by humanity as a collectivity through transcension and is achievable by all humans individually as part of our corporeal deaths. The naturalist school of thought states that decomposition is the achieve of post-corporeal cosmosis while the transtellationist school asserts that the soul or spirit of each human is taken up to the stars physically to complete the cosmosis process.  

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The notion of cosmosis holds minimal mention within the Omnidoxy, however, post-omnidoxically, it has risen to become a prominent concept of Astronist belief and is in fact central to the Astronist understanding of death and our individual and collective relationship to The Cosmos.  In Cosmic alchemy specifically, cosmosis is characterised as the final destination on a journey of discovery in which our discovery of the astronomical elixir is the ultimacy of our cosmic and corporeal existence. 

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In wider Millettic/Astronic eschatology and thanatology, cosmosis refers to an underlying belief structure stating that unity with The Cosmos is the fundamental destiny of all things residing and holding their inceptions from within The Cosmos. Cosmosis is a central concept which is interpreted differently by the schools of Astronic eschatology.

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**Perspective**

• Naturalistic
The naturalist school understands cosmosis through the idea that upon our corporeal deaths, humans, along with all other sentient, non-sentient, and inanimate entities within The Cosmos, physically become one with The Cosmos through decomposition.

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• Transcensionist
The transcensionist school takes an alternative understanding on the topic of cosmosis and incorporates a naturalist perspective in which decomposition occurs and we each become One with The Cosmos through that biological process. However, the transcensionist school proposes cosmical oneness on the centrality of the topic of space exploration and discovery; the transcensionist approach prioritises the achievement of transcension and equates transcension to cosmic union. The Humanic Exploration of The Cosmos is considered the cornerstone of the achievement of cosmosis from the transcensionist perspective.

Critically, transcensionists consider cosmosis not to have yet occurred in any instance principally due to the pretranscension state that humanity is in. Transcensionists therefore believe that because the transcension of humanity has not yet occurred due to humanity's inability to explore The Cosmos, that cosmosis cannot possibly have yet occurred to any human being. Therefore, transcensionists differ from naturalists in that they consider transcension to be the necessary prerequisite for cosmosis.

• Transtellationist
The transtellationist school understands cosmosis through the idea that becoming One with The Cosmos involves a spiritual element that the other two schools of Astronist eschatology do not incorporate. The transtellationist approach involves the notion that some supernatural process or action is involved with the completion of cosmosis, the principal example of which is transtellation.

**Forms**

Physical cosmosis
• Aeration –– this cosmic reunion occurs through the cremation of the body and the subsequent scattering of the deceased's ashes.

• Biodegradation –– this cosmic reunion occurs through the degrading of the body into the soil of the planet following a person's burial.

• Space burial –– this cosmic reunion is the most revered of all the physical cosmosises as it involves burial into space which demonstrates the greatest physical reunion with The Cosmos because of the direct nature of the burial into The Cosmos itself rather than on a cosmic progeny.

Spiritual cosmosis
• Transtellation 

**Cosmosis as the ultimation of Astronism**