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red shift

(Encyclopedia)red shift or redshift, in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the red, or longer wavelength, end of the visible spectrum. The effect...

red snapper

(Encyclopedia)red snapper: see snapper.

red spider

(Encyclopedia)red spider: see mite.

red spruce

(Encyclopedia)red spruce: see spruce.

red squill

(Encyclopedia)red squill: see squill.

red tide

(Encyclopedia)red tide: see Dinoflagellata.

Red Wing

(Encyclopedia)Red Wing, city (1990 pop. 15,134), seat of Goodhue co., SE Minn., on the Mississippi River at the head of Lake Pepin; inc. 1857. It is a commercial and manufacturing center in the Hiawatha valley farm...

color index

(Encyclopedia)color index, in astronomy, difference in an object's brightness as recorded between any two well-defined bands of the electromagnetic spectrum by using optical filters of different colors. If blue and...

Little Red River

(Encyclopedia)Little Red River, 105 mi (169 km) long, rising in the Boston Mts., NW Ark., and flowing SE to the White River. Greers Dam and reservoir (completed 1964) provide flood control and hydroelectric power. ...

Arctic Red River

(Encyclopedia)Arctic Red River, c.310 mi (500 km) long, rising in the Mackenzie Mts. of W Northwest Territories, Canada, and flowing generally NW to the Mackenzie River. At its mouth are a post of the Royal Canadia...