B Does the Big Bang Expansion Include All Objects in the Universe?

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The Big Bang theory describes the universe as continuously expanding, but this expansion does not apply to galaxies or planets. Instead, it refers to the movement of objects that are not strongly bound together, such as galaxy clusters, which gradually move apart over time. Within galaxy clusters, the gravitational forces are strong enough to prevent expansion among galaxies and other solid objects. Therefore, the term "expansion" specifically pertains to the increasing distance between larger cosmic structures. Understanding this distinction clarifies misconceptions about the nature of cosmic expansion.
Vivek Siddarth K
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We all know BigBang theory, which states that the universe is continuously expanding, my doubt is the term expanding, does it mean the expansion of galaxies as a whole or including the planets in it?.
 
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Vivek Siddarth K said:
We all know BigBang theory, which states that the universe is continuously expanding, my doubt is the term expanding, does it mean the expansion of galaxies as a whole or including the planets in it?.
It doesn't mean either one. Galaxies do not expand, nor do the planets. Only constructs larger than galactic clusters "expand" and by "expand" it just means they get farther apart. There are HUNDREDS (probably thousands) of threads on this there on PF. I suggest a forum search.
 
Expansion means that objects which are not bound strongly enough to each other, such as different galaxy clusters, gradually move apart over time. Inside of galaxy clusters, galaxies, planets, and any other 'solid' object, expansion does not occur because the forces holding these objects together is strong enough to resist expansion.
 
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phinds said:
It doesn't mean either one. Galaxies do not expand, nor do the planets. Only constructs larger than galactic clusters "expand" and by "expand" it just means they get farther apart. There are HUNDREDS (probably thousands) of threads on this there on PF. I suggest a forum search.
Thanks for the link... very interesting...
 

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