M 45 + B 7wide field in Taurus
Exposure time total:
Open star cluster (I3r) with reflection nebula
Canon EF 200mm f/2.8L @ f/3.5 + mechanical stopper
EOS 6D (ISO 1600)
Image acquisition by CEDIC team
(Bernhard Hubl, Christoph Kaltseis, Markus Blauensteiner)
Image processing by Bernhard Hubl
Mosaic of two frames
The Pleiades nebulae are blue-colored, which indicates that they are
reflection nebulae, reflecting the light of the bright stars situated near
(or within) them. Physically, the reflection nebula is probably
part of the dust in a molecular cloud, unrelated to the Pleiades cluster,
which happens to cross the cluster's way.
It is not a remainder of the nebula from which the cluster once formed.