This is the Rosette
Nebula, as featured on Astronomy Picture of the Day. Credit
& Copyright: href="http://www.robgendlerastropics.com/Biography.html">Robert Gendler.
Click on the image for the full size version.
It is in constellation Monoceros, which means Unicorn; just to the left
of Orion. According to Wikipedia, it is a “modern” constellation,
having been named in 1613, or perhaps 1564. I suppose in
astronomical terms, 1613 really is modern.