Reflection nebula Van den Berg (VdB) 152. This faint blueish nebula glows atop an elongated dark nebula called Barnard 175 in a dusty complex that has also been called Wolfs Cave. It is located nearly 1,400 light years away along the northern Milky Way in the constellation Cepheus. Pockets of interstellar dust in the region block light from background stars or scatter light from the embedded bright star giving the the nebula its characteristic blue colour. Another dense, obscuring dark nebula LDN 1221 can be seen at upper centre, while the more colourful planetary nebula Dengel-Hartl 5 is at centre right. Image captured from the Dark Sky Alqueva region in Portugal.