Editing Nucleus (section)

==Science, technology, and mathematics==
===Astronomy===
*[[Active galactic nucleus]] in astronomy
*[[Comet nucleus]], the solid, central part of a comet

===Biology===
*[[Cell nucleus]], a central organelle of a eukaryotic cell, containing most of the cell's DNA 
*[[Nucleus (neuroanatomy)]], a cluster of cell bodies of neurons in the central nervous system
*Nucleus that forms in the eye in [[nuclear sclerosis]] (early cataracts)
*''Nucleus'', a scientific journal concerned with the cell nucleus; published by [[Taylor & Francis]]
*[[Beekeeping#Artificial_swarming|Nucleus]], a small colony of honeybees, induced to raise a new queen by the beekeeper

===Computer systems===
* [[Nucleus (operating system)]], sometimes a synonym for kernel
* [[Nucleus CMS]], a weblog system
* [[Nucleus RTOS]], a real-time operating system (RTOS)
* Nucleus, part of an operating system loaded by an [[Booting#IPL|Initial Program Load]] or boot loader

===Mathematics===
*[[Nucleus (algebra)]], the elements of a ring that associate with all others
* [[Nucleus (order theory)]], a mathematical term

===Other sciences===
*[[Nucleus (syllable)]], in linguistics, the central part of a syllable
*[[Atomic nucleus]], the very dense central region of an atom
*[[Condensation nucleus]], the seed of a raindrop
**[[Ice nucleus]], the seed of a snowflake