OBSCURATION OF VISIBLE LIGHT
Figure 18.12(a) is an optical photograph of a typical interstellar dust cloud.
The obscuration of starlight by interstellar dust. Light is scattered off of dust grains, so that a distant star appears dimmer than it otherwise would.
To cause the obscuration of; to darken or hide; -- said of a heavenly body; as, the moon eclipses the sun.
2.
To obscure, darken, or extinguish the beauty, luster, honor, etc., of; to sully; to cloud; to throw into the shade by surpassing.
Eclipse - The obscuration of the light from the Sun when the observer enters the Moon's shadow or the Moon when it enters the Earth's shadow. Also, the obscuration of a star when it passes behind its binary companion ...
INTERSTELLAR OBSCURATION
Unfortunately, the effects of interstellar reddening due to intervening dust both in our own galaxy and in the parent spiral galaxies of extragalactic Cepheids can be quite severe and are very much stronger.
Extinction (the obscuration of background objects by intervening dust) towards the Galactic centre is generally very high. Consequently, detailed studies of the central regions of our Galaxy are difficult.
ceilings (meteorology) (NASA Thesaurus) The height above the Earth's surface of the lowest layer of clouds or obscuring phenomena that is reported as "broken", overcast" or "obscuration" and not classified as "thin" or "partial".
solar eclipse The obscuration of the light of the sun by the moon.
Due to a combination of redshift, dust obscuration, and the intrinsically low temperatures of many of the sources to be studied, the JWST must operate at infrared wavelengths, spanning the wavelength range from 0.6 to 28 micrometres.
In the "unified scheme", broadly traceable to Blandford & Königl (1979 ApJ 232, 34), beaming and obscuration make QSOs look different from different directions.
These are responsible for the dark patches of obscuration seen on astronomical photographs. The particles are composed of common heavy elements such as carbon and silicon but there is no agreement about the exact composition of the dust grains.
In the past, astronomers have identified Martian dust clouds and/or obscurations as "yellow clouds." It is incorrect to describe the color of Martian dust clouds as "yellow.
Glass brick, also known as glass block, is an architectural element made from glass used in areas where privacy or visual obscuration is desired while admitting light, such as underground parking garages, washrooms, ...
The combination was designed to reduce the obscuration by atmospheric haze. The haze is more transparent at 938 nanometers than at shorter wavelengths, and light of 938 nanometers wavelength is not absorbed by methane gas in Titan's atmosphere.
On 23 April 1994, there were reports of an obscuration over the so-called Cobrahead feature on a region called the Aristarchus plateau.
In any case, observation of very new born stars of any mass is impossible at visible wavelengths due to heavy obscuration by the dust that cocoons these nascent stars.
Optical astronomers had missed a great number of galaxies, because of the obscuration, but with hindsight (and with better observations), could spot many more galaxies.
The size of each of the blobs is the size of the smallest detail that can be seen with that telescope under ideal conditions. Atmospheric distortion effects (smearing of the binary star images to a blob the size of the entire frame) and obscuration ...
2 Previously to each obscuration, the star was found to be moving rapidly away from the earth; its velocity then diminished to zero pari passu with the loss of light, and reversed its direction during the process of recovery.
means "cloud"; its plural is "nebulae.'') Nebulae can make themselves apparent by glowing (as "emission nebulae''), by scattering light from stars within them (as "reflection nebulae''), or by blocking light from things behind them (as "obscuration ...
X-ray evidence, where available, supports the unified picture: radio galaxies show evidence of obscuration from a torus, while quasars do not, although care must be taken since radio-loud objects also have a soft unabsorbed jet-related component, ...
may come from the mass of a "Great Attractor" at a distance of 108 million light-years connected to the Local Supercluster, but this interpretation is somewhat controversial since much of the supposed grouping lies behind the obscuration of the plane ...
The scattered objects between the Sun and the Kuiper belt are known as centaurs. The scale is in astronomical units. The pronounced gap at the bottom is due to obscuration by the band of the Milky Way.
of T Tauri stars (with time-scales from minutes to years) are probably caused by instabilities in the accretion disk (which also produce the “bullets' of material seen in the jet of HH-30), flares on the stellar surface, or simple obscuration ...
 See also: Light, Time, Second, Energy, Norma
  
|
RSS
