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Hertzsprung-Russell diagram

(Encyclopedia)CE5 The Hertzsprung-Russell diagram shows the relation between the luminosity and surface temperature (which is related to spectral class, or color) of the stars in the Milky Way. Most stars fall a...

Dominica

(Encyclopedia)CE5 Dominica dŏmĭnēˈkə [key], officially Commonwealth of Dominica, republic (2015 est. pop. 73,000) consisting of the island of Dominica (290 sq mi/750 sq km), located in the Windward Islands,...

electric circuit

(Encyclopedia)CE5 A. Series circuit: Current is the same through each resistance; voltage divides in direct proportion to each resistance. B. Parallel circuit: Voltage drop is the same over each resistance; curr...

electromagnetic radiation

(Encyclopedia)CE5 Electromagnetic spectrum electromagnetic radiation, energy radiated in the form of a wave as a result of the motion of electric charges. A moving charge gives rise to a magnetic field, and if ...

buttercup

(Encyclopedia)CE5 Common buttercup, Ranunculus acris buttercup or crowfoot, common name for the Ranunculaceae, a family of chiefly annual or perennial herbs of cool regions of the Northern Hemisphere. Thought to...

wood

(Encyclopedia)CE5 Wood A. Cross section of a woody stem B. Enlarged view, showing xylem, phloem, and cambium wood, botanically, the xylem tissue that forms the bulk of the stem of a woody plant. Xylem conducts ...

cathedral

(Encyclopedia)CE5 Floor plan of a cathedral cathedral, church in which a bishop presides. The designation is not dependent on the size or magnificence of a church edifice, but is entirely a matter of its assign...

nucleic acid

(Encyclopedia)CE5 Replication of strands of DNA CE5 nucleic acid, any of a group of organic substances found in the chromosomes of living cells and viruses that play a central role in the storage and replica...

vector

(Encyclopedia)vector, quantity having both magnitude and direction; it may be represented by a directed line segment. Many physical quantities are vectors, e.g., force, velocity, and momentum. Thus, in specifying a...

theater

(Encyclopedia)CE5 Plan of Greek amphitheater CE5 Proscenium theater CE5 Theater-in-the-round theater, building, structure, or space in which dramatic performances take place. In its broadest sense theater...