24 JUNE 2020 • SKY & TELESCOPE
Imaging Targets
SOME REFLECTIONS The
vast majority of nebulae that
made the Sharpless list are
exclusively emission nebulos-
ity, which emits light at the
red end of the spectrum. But
several objects, including
NGC 1977 at top (Sh 2-279)
and M42 (Sh 2-281) seen
below contain bluish refl ection
nebulosity.