The northern Milky Way
in the area over cipher Cassiopeia to Peruses is rich in interstellar matter.
There are not only bright H II regions, but also reflection nebula and a lot of
dark dust and molecular clouds. The current Academy of Sciences demonstrates a
very nice example of a combination of molecular cloud and reflection nebula,
namely, a brownish, elongated cloud in the border area Andromeda and
Cassiopeia.
