Astronomy Magazine – Your source for the latest news on astronomy, observing events, space missions, and more.
Picture of the Day
Dust on dust
Lynn Hilborn from Grafton, Ontario
The origin of the reflection nebula vdB 9 in Cassiopeia is the Cepheid variable star SU Cas; its blue light is reflected by surrounding dust, which are themselves partially shrouded by thicker dust clouds. This image represents 5 hours of exposure on an 8-inch scope in RGB filters.