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Here we examine the principal way in which astronomers have learned so much about the stars. Pass sunlight through a triangular prism or bounce it off the finely grooved surface of a compact audio disk and see it break merrily into a band of pure sparkling color, its "spectrum," familiar in the colors of a rainbow, in light glittering from newly fallen snow, in the rings and haloes around a partly- clouded Sun and Moon, in the flash of a cut diamond, and in so many other facets of nature.

"Spectra" is embedded with links that will take you back to the appropriate parts of the above two sites. The classic colors red, orange, yellow, green, blue, and violet connect in a seemingly infinite number of shades, one blending smoothly into the next.

The syntax for creating a sequence in Oracle is: is the starting value of the sequence, and is the interval between consecutive sequence numbers.

Both [START WITH] and [INCREMENT BY] are optional fields.

If they are not specified, the default and are both 1.

Assume we have a table with the following structure: Table USER_TABLE It is worth noting that a sequence is independent of a table.

What is nice about clusters is that differences in the stars can be explained in terms of only one variable: mass.

Stars in a cluster all form at about the same time, so age differences is not a factor in our analysis.

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When color-magnitude (H-R) diagrams for star clusters are constructed, there is a convincing confirmation of our stellar evolution models.In other words, a sequence can be used to generate primary key values for multiple tables, and the sequence continues even if it is being applied to a different table.This site, closely coupled to The Natures of the Stars and The Hertzsprung- Russell (HR) Diagram, provides an introduction to the spectra of stars and allied celestial objects.Several dating methods exist, depending on different criteria and techniques, and some very well known examples of disciplines using such techniques are, for example, history, archaeology, geology, paleontology, astronomy and even forensic science, since in the latter it is sometimes necessary to investigate the moment in the past in which the death of a cadaver occurred.Relative dating methods are unable to determine the absolute age of an object or event, but can determine the impossibility of a particular event happening before or after another event of which the absolute date is well known.

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