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This image is believed to be non-free or possibly non-free in its home country, the United Kingdom. In order for Commons to host a file, it must be free in its home country and in the United States. Some countries, particularly other countries based on common law, have a lower threshold of originality than the United States.
The photograph depicts a lush green rolling hill with cirrus clouds during a daytime sky, with mountains far in the background. [1] [2] It was taken by Charles O'Rear, a former National Geographic photographer and resident of St. Helena, California, in the Napa Valley region north of San Francisco, while on his way to visit his girlfriend in ...
GIF animation of an Apollonian sphere packing with transparent background. Transparency in computer graphics is possible in a number of file formats.The term "transparency" is used in various ways by different people, but at its simplest there is "full transparency" i.e. something that is completely invisible.
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At a lower limit, clear sky (cloud-free) conditions promote the largest opening of transmission windows. The more uniform concentration of long-lived trace greenhouse gases in combination with water vapor pressures of 0.25-20 mbar then yield minimum values in the range of ε a =0.55-0.8 (with ε=0.35-0.75 for a simulated water-vapor-only ...
Background radiation is largely homogeneous and isotropic. A slight detectable anisotropy is present which correlates to galaxy filaments and voids [ 2 ] [ 3 ] . The discovery (by chance in 1965) of the cosmic background radiation suggests that the early universe was dominated by a radiation field, a field of extremely high temperature and ...
Commercial, freeware and free software packages are available specifically for astronomical photographic image manipulation. [18] "Lucky imaging" is a secondary technique that involves taking a video of an object rather than standard long exposure photos. Software can then select the highest quality images which can then be stacked. [19]
The particles scatter light from the sun and the rest of the sky through the line of sight of the observer, thereby decreasing the contrast between the object and the background sky. Particles that are the most effective at reducing visibility (per unit aerosol mass) have diameters in the range of 0.1-1.0 μm.
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