A starry night for many sunny afternoons

"W5 is a nebula, a giant cloud of gas roughly 6000 light years away in the constellation of Cassiopeia. It’s enormous, spanning about 2 x 1.5 degrees of the sky (15 times the size of the full Moon on the sky), and is actively cranking out stars."

Many thanks, dinogirl!

(Do click through for the larger version of the image. It's stunningly beautiful.)