In Jain philosophy, stars are not considered living beings in the same way as humans, animals, devas, or nigodas. They are understood as pudgala (material substances) within the universe.

About agnikāya:

• Agnikāya means the class of fire-bodied living beings.
• These are one-sensed jīvas associated with fire phenomena in the world.
• The core of stars is not described in Jain texts as agnikāya.

So, in simple words:

• Stars themselves are not “alive” as jīvas
• Their core is not said to be made of agnikāya
• Agnikāya are fire-bodied living beings in the earthly realm, not the physical core of stars

If you want, I can also explain Jain cosmology of सूर्य, चंद्र, and nakshatras in simple language.