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This is a list of the largest cosmic structures so far discovered. The unit of measurement used is the light-year (distance traveled by light in one Julian year; approximately 9.46 trillion kilometres).
This list includes superclusters, galaxy filaments and large quasar groups (LQGs). The list characterizes each structure based on its longest dimension.
Note that this list refers only to coupling of matter with defined limits, and not the coupling of matter in general (as per example the cosmic microwave background, which fills the entire universe). All structures in this list are defined as to whether their presiding limits have been identified.
There are some speculations about this list:
The Zone of Avoidance, or the part of the sky in which the Milky Way is occupied, blocks out light to several structures, making their limits imprecisely identified.
Some structures are far too distant to be seen even with the most powerful telescopes. Some factors are included to explain the structure (like gravitational lensing and redshift data).
Some structures have no defined limits, or endpoints. All structures are believed to be part of the cosmic web, which is a conclusive idea. Most structures are overlapped by nearby galaxies, creating a problem of how to carefully define the structure's limit.
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