What are the major theories pertaining to the nature of expanding galaxy? Explain each.
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Answer:
The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time.
Explanation
It is an intrinsic expansion whereby the scale of space itself changes. The universe does not expand "into" anything and does not require space to exist "outside" it. Technically, neither space nor objects in space move. Instead it is the metric governing the size and geometry of spacetime itself that changes in scale. Although light and objects within spacetime cannot travel faster than the speed of light, this limitation does not restrict the metric itself. To an observer it appears that space is expanding and all but the nearest galaxies are receding into the distance.
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Answer:
The cosmological theory based on the work of Edwin Hubble that holds that the universe is expanding. Central to the theory is the interpretation of the color shift in the spectra of all observed galaxies as being the result of the Doppler effect, indicating that the galaxies are moving away from one another.
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