Why are some stars bright and others dim

What is a star?A star is any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources. Of the tens of billion. . How is a star’s brightness measured?Astronomers define stellar brightness in terms of magnitudes: the apparent magnitude (the perceived and measured brightness of a star) and the abso. . Why do stars tend to form in groups?Stars tend to form in groups because of where star formation occurs. Stars form within a molecular cloud, where protostars begin to take shape in a. . Why do stars evolve?Stellar evolution occurs when a star loses its energy from continuous nuclear fusion reactions, causing instability due to decreasing gas pressure. . [pdf]
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Electrical power industry wikipedia

When did electrical engineering emerge as a discipline?Electrical engineering may be said to have emerged as a discipline in 1864 when the Scottish physicist James Clerk Maxwell summarized the basic law. . What was the first practical application of electrical engineering?The first practical application of electrical engineering was the telegraph, invented by Samuel F.B. Morse in 1837.. What kind of research is done in electrical and electronics engineering?The research functions of electrical and electronics engineering include basic research in physics and other sciences, applied research, design of. [pdf]
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