Search results
Results from the WOW.Com Content Network
For example, the night sky looks darker than Eigengrau because of the contrast provided by the stars. Contrast threshold data, collected by Blackwell [ 5 ] and plotted by Crumey , shows Eigengrau occurring at adaptation luminances below approximately 10 − 5 cd m −2 (25.08 mag arcsec −2 ). [ 6 ]
The following is a list of stars with resolved images, that is, stars whose images have been resolved beyond a point source. Aside from the Sun , observed from Earth , stars are exceedingly small in apparent size, requiring the use of special high-resolution equipment and techniques to image.
The star-effect may be also caused by the inclusions of hematite. In black star sapphire hematite needles formed parallel to the faces of the second order prism produce asterism. Some star sapphires from Thailand contain both hematite and rutile needles forming a 12-ray star. [3] Star-stones were formerly regarded with much superstition. [1]
American film and television studios terminated production of black-and-white output in 1966 and, during the following two years, the rest of the world followed suit. At the start of the 1960s, transition to color proceeded slowly, with major studios continuing to release black-and-white films through 1965 and into 1966.
Standard yellow five-pointed star with eyes: Date: 19 August 2007, 16:21 (UTC) Source: self-made, in imitation of the GFDL image Image:Mariostar2.png by NeonMerlin on the English Wikipedia: Author: Anomie: Permission (Reusing this file)
Stars tend to fall only into certain regions of the diagram. The most prominent is the diagonal, going from the upper-left (hot and bright) to the lower-right (cooler and less bright), called the main sequence. In the lower-left is where white dwarfs are found, and above the main sequence are the subgiants, giants and supergiants.
The Stars: A New Way to See Them is an astronomy book by H. A. Rey. It was first published in 1952 (Houghton Mifflin, Boston) and revised in 1962. It was updated again in 1997. Other editions were: Chatto and Windus, London, 1975; "A New Way to see the Stars", Paul Hamlyn, London, 1966; Enl. World-wide ed. Houghton Mifflin, 1967.
The Bright Star Catalogue, which is a star catalogue listing all stars of apparent magnitude 6.5 or brighter, or roughly every star visible to the naked eye from Earth, contains 9,096 stars. [1] The most voluminous modern catalogues list on the order of a billion stars, out of an estimated total of 200 to 400 billion in the Milky Way .