Here is a concise Jain perspective on Universe Cosmology (loka) as taught in Jain scriptures and tradition:

• The universe is without a beginning or end and is made of two basic categories: jiva (sentient beings) and ajiva (non-sentient substances such as matter, space, time, and principles). There is no creator god who made the universe; it operates by its own natural laws and karma.

• Loka (the world) is organized into three broad realms:

- Urdhva-loka (upper region): the world of celestial beings and heavens (devas and siddhas) where long life and great pleasures may exist. - Madhya-loka (middle region): the living beings we commonly encounter—humans, animals, plants, microbes—where karma is actively accumulated and liberated. - Adho-loka (lower region): the realms of hells and painful existences where suffering continues as a result of negative karma.

• The center of the universe is Mount Meru, surrounded by a circular arrangement of continents and oceans. The most important landmass is Jambudvipa (the southern continent), with other regions around it. This cosmological map is used in many Jain texts and rituals to illustrate the vast, multi-layered structure of the loka.

• Time is cyclical and consists of two alternating halves:

- Utsarpini (ascending or increasing happiness) and Avasarpini (descending or decreasing happiness). Each half passes through a succession of eras or ages, during which conditions such as human lifespans, morality, and spiritual opportunities rise and fall. - The cycle continues without a beginning or end; beings progress or decline spiritually in accordance with the karma they accumulate.

• The moral and spiritual message: every soul (jiva) is on a path of bondage or liberation depending on its karma. Right faith (samyak-darsana), right knowledge (samyak-jnana), and right conduct (samyak-charitra) lead to purification of the soul and, ultimately, liberation (moksha) from the cycle of birth and death.

• Important nuance across Digambar and Shwetambar traditions:

- The broad cosmological framework (jiva/ajiva, three realms, cyclic time, and the central Meru picture) is shared. - There can be stylistic or detail-oriented differences in texts and interpretations, but the essential concepts—eternal universe, karma-driven lifetimes, and the goal of liberation—are common to both traditions. If a specific sutra or cosmology description is being studied, it is good to note the traditional stance of the Digambar and Shwetambar schools for that text, as there can be variations in wording or emphasis.

If you’d like, I can provide a brief, plain-language excerpt from a Jain cosmology passage and translate its meaning (arth) in a way that respects the Jain source tradition.