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universe is a huge bubble of space time, that contains different things. Universe is possibly infinite, but more likely it's finite, and just one of many.

Levels Edit

Superclusters Edit

superclusters are huge groups of galaxies, or, also, Cluster of Galaxy Clusters

most of them contains more than 100 000 galaxies

Clusters Edit

clusters are huge groups of galaxies, they are containing much less galaxies than superclusters

Groups Edit

groups are galaxial clusters that are too small to be called normal cluster. Mostly, 50-150 galaxies in them.

Galaxies Edit

Galaxies (shouldn't be confused with paragalaxies) are gravitationally bound systems of stars, stellar remnants, interstellar gas, dust, and dark matter.

Stars Edit

stars are huge balls of heated gas, that made up a ball, because of gravity. Stars are classified by "spectral classes": O, B, A, F, G, K, M. There is also secondary classes: L, T, Y, C, S and D.