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Reflection nebulae themselves do not emit significant amounts of visible light, but are near stars and reflect light from them. [25] Similar nebulae not illuminated by stars do not exhibit visible radiation, but may be detected as opaque clouds blocking light from luminous objects behind them; they are called dark nebulae. [25]
Barnard 68 is a molecular cloud, dark absorption nebula or Bok globule, towards the southern constellation Ophiuchus and well within the Milky Way galaxy at a distance of about 125 parsecs (407 lightyears). [2]
A dark nebula or absorption nebula is a type of interstellar cloud, particularly molecular clouds, that is so dense that it obscures the visible wavelengths of light from objects behind it, such as background stars and emission or reflection nebulae.
A starchart of the Orion Nebula. Optical images reveal clouds of gas and dust in the Orion Nebula; an infrared image (right) reveals the new stars shining within. The entirety of the Orion Nebula extends across a 1° region of the sky, and includes neutral clouds of gas and dust, associations of stars, ionized volumes of gas, and reflection ...
The name Tarantula Nebula arose in the mid-20th century from its appearance in deep photographic exposures. [7] 30 Doradus has often been treated as the designation of a star, [8] [9] or of the central star cluster NGC 2070, [10] but is now generally treated as referring to the whole nebula area of the Tarantula Nebula. [11] [12]
The Rho Ophiuchi cloud complex with its main dark nebula Lynds 1688, speckled with its pinkish young stellar objects, just left to HD 147889 surrounded by IC 4603 as the bright area at the center. The red area called Sh2-9 has Sigma Scorpii at its center, and Antares is just outside the picture at the bottom.
An interstellar cloud is generally an accumulation of gas, plasma, and dust in our and other galaxies. But differently, an interstellar cloud is a denser-than-average region of the interstellar medium, the matter and radiation that exists in the space between the star systems in a galaxy.
The overall nebula with smaller hole shown in context. NGC 1999, also known as The Cosmic Keyhole, [1] [2] is a dust-filled bright nebula with a vast hole of empty space represented by a black patch of sky, as can be seen in the photograph. It is a reflection nebula, and shines from the light of the variable star V380 Orionis.