Here's why:
* The Expanding Universe: The universe is not static. It's expanding, meaning the space between galaxies is constantly growing. This expansion isn't like things moving through space; it's space itself expanding.
* Hubble's Law: This law states that the further away a galaxy is, the faster it appears to be moving away from us. This isn't due to galaxies actually "flying through space," but because the space between us and them is expanding.
* The Acceleration: Not only is the universe expanding, but it's doing so at an accelerating rate. This means the rate at which galaxies move apart is increasing over time.
So, even though the furthest star is already incredibly distant, the space between us and it continues to expand, making it appear to move even further away. This is a consequence of the ongoing expansion of the universe and its accelerating nature.
An analogy: Imagine a balloon with dots drawn on it. As you inflate the balloon, the dots move further apart from each other, even if they themselves are not moving across the surface. This is similar to how galaxies are moving away from each other due to the expansion of the universe.
It's important to remember that this expansion doesn't mean galaxies are flying away from each other at incredible speeds through space. Instead, the space between them is growing, causing them to appear further apart over time.
