The Big Bang theory describes the continuous expansion of the universe, but this expansion does not apply to galaxies or planets. Instead, only structures larger than galactic clusters experience this expansion, meaning that objects not bound by strong gravitational forces, such as different galaxy clusters, gradually move apart over time. Within galaxy clusters, the gravitational forces are sufficient to prevent expansion, keeping galaxies and planets intact. This distinction is crucial for understanding cosmic expansion.
PREREQUISITESAstronomers, astrophysicists, students of cosmology, and anyone interested in the mechanics of the universe's expansion.
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.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?.
Thanks for the link... very interesting...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.