GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The range of magnitude over which.a physical property can vary
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A large grouping of stars, planets, gases and dust in space that is held together by gravity
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A self-luminous celestial body consisting of a mass of gas held together by its own gravity in which the energy is generated by nuclear reactions in its interior
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A theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago.
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Detailed explanation-1: -A self-luminous celestial body consisting of a mass of gas held together by its own gravity in which the energy is generated by nuclear reactions in its interior. A plot of the surface temperature (color) of stars vs. their luminosity (brightness).
Detailed explanation-2: -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 billions of trillions of stars in the observable universe, only a very small percentage are visible to the naked eye.
Detailed explanation-3: -A star is defined to be a self-luminous gaseous spheroidal celestial body of great mass which produces energy by means of nuclear fusion reactions. Fusion is the act of turning lighter elements into heavier ones which can only occur under great pressures.