http://apod.nasa.gov/apod/ap130122.html
This picture shows a large cloud of gas in the constellation of Cygnus. It is known as the "Cygnus Wall". It's actually just a massive amount of hot gas. It is part of what is known as the "North American Nebula". I don't really know why it is called that- to me it doesn't look like North America at all. But none the less, this is an amazing spectacle.
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