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NGC 7662 is a planetary nebula located in the northern constellation Andromeda.It is known as the Blue Snowball Nebula, Snowball Nebula, and Caldwell 22.This nebula was discovered October 6, 1784 by the German-born English astronomer William Herschel.
In sociology and statistics research, snowball sampling [1] (or chain sampling, chain-referral sampling, referral sampling [2] [3]) is a nonprobability sampling technique where existing study subjects recruit future subjects from among their acquaintances. Thus the sample group is said to grow like a rolling snowball.
A snowball. A snowball is a spherical object made from snow, usually created by scooping snow with the hands and pressing the snow together to compact it into a ball. [1] Snowballs are often used in games such as snowball fights. A snowball may also be a large ball of snow formed by rolling a smaller snowball on a snow-covered surface.
Alternatively, gravity can move the snow rollers as when a snowball, such as those that will fall from a tree or cliff, lands on a steep hill and begins to roll down the hill. [4] Because of this last condition, snow rollers are more common in hilly areas. [1] However, the precise nature of the conditions required makes them a very rare phenomenon.
In social science research, snowball sampling, or "snowballing": a technique for developing a research sample; In researching a field, snowballing is another name for Pearl growing; In chemical and industrial engineering, snowballing is the second and last phase, after aggregation, of the pelletization process.
A snowball effect [1] is a process that starts from an initial state of small significance and builds upon itself (an exacerbating feedback), becoming larger (graver, more serious), and also perhaps potentially more dangerous or disastrous (a vicious circle), though it might be beneficial instead (a virtuous circle).
The snowball Earth hypothesis was originally devised to explain geological evidence for the apparent presence of glaciers at tropical latitudes. [15] According to modelling, an ice–albedo feedback would result in glacial ice rapidly advancing to the equator once the glaciers spread to within 25° [ 16 ] to 30° [ 17 ] of the equator.
The snowball clause is one way that editors are encouraged to exercise common sense and avoid pointy, bureaucratic behavior. The snowball clause states: The snowball clause states: If an issue has a snowball's chance in hell of being accepted by a certain process, there's no need to run it through the entire process.