This is a consequence of the expansion of the universe, which is a fundamental concept in cosmology. Here's why:
* Expansion of the universe: Imagine the universe as a balloon with galaxies painted on it. As the balloon inflates, the galaxies move apart, even though they aren't physically moving on the balloon's surface. Similarly, the fabric of space itself is expanding, causing galaxies to move farther apart.
* Hubble's Law: This law states that the speed at which a galaxy is moving away from us is directly proportional to its distance from us. This means that the farther a galaxy is, the faster it is receding.
Important Note: While galaxies move away from each other due to the expansion of the universe, gravity can cause galaxies to move towards each other within a galaxy cluster or supercluster. This is a separate phenomenon from the overall expansion.
