What phenomenon is suggested by the theory that galaxies are constantly being pushed apart?

The concept of galaxies being pushed apart refers to the expanding universe, a phenomenon supported by observations such as the redshift of distant galaxies. As these galaxies move away from us, the light they emit is stretched, causing it to shift toward the red end of the spectrum. This redshift indicates that the universe is not static but is instead expanding over time.

The expanding universe theory aligns with the Big Bang model, which posits that the universe originated from an extremely hot and dense state and has been expanding ever since. This expansion occurs uniformly, affecting galaxies regardless of their location in the universe.

Understanding this phenomenon highlights the vastness of the cosmos and provides insights into its formation and future evolution. It is a fundamental principle in modern cosmology and helps explain a variety of astronomical observations, including the Cosmic Microwave Background radiation and the distribution of galaxies in space.