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Canis Major

(Encyclopedia)Canis Major kāˈnĭs [key] [Lat.,=greater dog], constellation lying near the celestial equator, SE of Orion. Known as the Large Dog (Canis Minor is the Small Dog), it was associated with the figure o...

sapphire

(Encyclopedia)sapphire, precious stone. A transparent blue corundum, it is classified among the most valuable of gems. Sapphires are found chiefly in Madagascar, Sri Lanka, and Myanmar and also in Thailand, Tanzani...

nuclear energy

(Encyclopedia)CE5 Graph of binding energy per nucleon as a function of mass number nuclear energy, the energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity. In these pr...

Melrose, city, United States

(Encyclopedia)Melrose, city (1990 pop. 28,150), Middlesex co., E Mass., a suburb of Boston; settled c.1629, set off from Malden and inc. 1850. It is chiefly residential. The opera star Geraldine Farrar was born in ...

fermium

(Encyclopedia)fermium fûrˈmēəm [key] [for Enrico Fermi], artificially produced radioactive chemical element; symbol Fm; at. no. 100; mass no. of most stable isotope 257; m.p. 1,527℃; b.p. and sp. gr. unknown;...

twilight

(Encyclopedia)twilight, period between sunset and total darkness or between total darkness and sunrise. Total darkness does not occur immediately when the sun sinks below the horizon because light from the sun that...

southern tick-associated rash illness

(Encyclopedia)southern tick-associated rash illness (STARI) or Masters disease, illness characterized by a Lyme disease–like rash that is associated with bite from the Lone Star tick (Amblyomma americanum) rather...

Bessel, Friedrich Wilhelm

(Encyclopedia)Bessel, Friedrich Wilhelm frēdˈrĭkh vĭlˈhĕlm bĕsˈəl [key], 1784–1846, German astronomer and mathematician. He became (1810) director of the new observatory at Königsberg and professor of a...

Cepheid variables

(Encyclopedia)Cepheid variables sēˈfēĭd [key], class of variable stars that brighten and dim in an extremely regular fashion. The periods of the fluctuations (the time to complete one cycle from bright to dim a...

crescent

(Encyclopedia)crescent, emblematic representation of the quarter moon. The crescent and star, ancient Byzantine symbols that became the emblems of Constantinople, were also assumed as the standard of the Ottoman Tu...