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North America Nebula

C20, NGC 7000

A wide expanse of gas and dust spanning some fifty light years, this bright nebula ia partially hidden behind dark trails of material. One dense strand divides it from the nearby Pelican Nebula (which is actually part of the same stucture) and etches the edge of the North America Nebula to give it a remarkable resemblance to the coastline of North America on Earth.

The North America Nebula covers an area of Earth's sky several times that of the Moon's disc, though at a distance of some 2,000 light years it is so faint that it is barely visible to the naked eye under even ideal conditions. It lies southward and eastward of the bright star Deneb at the tail of Cygnus the Swan, in the middle of the Milky Way and on the fringes of the dark cloud known as the Cygnus Rift.

The glow of the nebula's hydrogen clouds comes from the ionising effect of the young stars within it, notably the intensely hot O-type star HR 8023, which lies in approximately the region of the Great Lakes on the equivalent North American continent. This ionisation effect pushes outwards to form a boundary to the nebula, and this ionisation front is particularly noticeable along the nebula's southeastern side (or the western coast of Mexio on an analogous map of North America). There it forms a long sinuous structure known as the Cygnus Wall.


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