reflection nebula

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reflection nebula

n.
A nebula that reflects the light of a nearby star or stars toward Earth rather than emitting its own light.
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Other bright clouds are reflection nebulae, which are lit by cooler stars and reflect light towards us.
Light from the star shining on the inside of this cavity is believed to be the source of illumination of the fan-shaped reflection nebulae which we typically see.
Circinus also offers a dark and reflection nebulae in its circle of elusive objects.
Their variability, in contrast to the unchanging appearance of most reflection nebulae, was thought to arise principally because they happened to be illuminated by variable stars, though in some cases the movement of dust lanes might give rise to added variability, casting transient shadows across regions of space measuring light-months across.
Prominent among them are M43, directly north of M42 and separated from it by a dark lane--and clearly visible in the same low power field as M42--while slightly further north is a complex area of emission and reflection nebulae commonly known as the Running Man Nebula (NGC 1977).
A wonderful interplay of dark, emission, and reflection nebulae, Rho ([rho]) Oph lies about 1[degrees] north of Antares.
A wideband filter may boost contrast a little, but a narrowband nebula filter won't help because you'll be looking at reflection nebulae.
The reflection nebulae Van den Berg 105 (at right) and 106 form part of the Rho Ophiuchi complex.
For the same reason, LPR filters are also ineffective on reflection nebulae, since these objects shine only by the reflected light of stars.
In a telescope at a magnification of 150x, Hubble's Variable Nebula is one of the best reflection nebulae in the sky.