What hierarchy level is the Milky Way within the cosmic structure?

Answer

It is part of the Local Group of galaxies

The cosmic hierarchy places the Milky Way as part of the Local Group of galaxies. The hierarchy proceeds from the nebula (an H II region), to the host dwarf galaxy (the Large Magellanic Cloud), to the larger spiral galaxy (the Milky Way), and finally into larger galactic clusters like the Local Group. This nested arrangement clarifies that the nebula is but a minor component in an increasingly vast and complex cosmic architecture.

What hierarchy level is the Milky Way within the cosmic structure?

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Most Massive Star and the Tarantula Nebula | Hubble Images 4K

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