Spectra are conditions or values that vary over a continuum. In most modern usages of the word spectrum, there is a unifying theme of between extremes at either end. ...
Spectra, a rock band, playing both original music and classic rock covers. Spectra's typical set list consists of both original songs along with a variety of cover songs by classic rock artists such as Heart, The Eagles, and Led Zeppelin to name a few.
Spectra Marketing, part of the Homescan business, owned by the Nielsen Company
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Spectra® fiber is used in numerous high-performance applications, including police and military ballistic-resistant vests, helmets and armored vehicles, as well as sailcloth, fishing lines, marine cordage, lifting slings, and cut-resistant gloves and apparel.
Spectra® fiber 900 was the first commercially available extended-chain, high-strength polyethylene fiber and the first in a series of Spectra® fibers.
Spectra Guard™ CX engineered yarn combines the cut resistance of Spectra Guard™ engineered yarn technology with the comfort and suppleness of cotton for gloves with an extraordinary combination of cut resistance, comfort, and wearability.
Spectra can also be created by the interference of light waves, the phenomenon that makes the brightly colored patterns seen reflected from a compact audio disc and the halos often observed next to a bright, partly clouded Moon.
Stellar spectra were first observed in the middle of the 19th century.
The differences in stellar spectra, at least for main sequence stars, are caused almost entirely by differences in ionization (after all, if sodium is all ionized, the absorptions of neutral sodium will not be present) and the by the way in which the absorption efficiencies change with temperature.
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