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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When were generators invented

Who is the father of electronic?Michael Faraday is known as the Father of Electronics.. When was electronic invented?Sir John Ambrose Fleming invented the first electronic device called the vacuum tube in 1904.. What are the major events in the history of electronics?Major events in the history of electronics: 1752 – Benjamin Franklin discovered that lightning is electrical by flying a kite, and explained how Le. [pdf]
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