Sh2-155: The Cave Nebula: http://apod.nasa.gov/apod/ap141106.html
About 2,400 years away, the Cave Nebula lies along the plane of the Milky Way, near Cepheus. It has formed at the boundary of the Cepheus B molecular cloud and the stars of the Cepheus OB 3 association. The ionization is driven by radiation, which is likely causes new stars to form. This nebula is 10 light years across.
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