The speeds at which galaxies move away from Earth are determined by their distance from us, not their proximity to other galaxies. This is due to the expansion of the universe.

Here's the breakdown:

* Nearby galaxies: These galaxies are relatively close to us, and their speeds are still affected by the expansion of the universe, but their recessional velocities are lower. This means they are moving away from us at slower speeds.

* Distant galaxies: These galaxies are much farther away. As the universe expands, the space between us and these distant galaxies stretches, causing their recessional velocities to be significantly higher. The farther away a galaxy is, the faster it appears to be moving away from us.

In summary: Distant galaxies are moving away from Earth at much higher speeds than nearby galaxies.

Important Note: This is a simplified explanation. The actual speed of a galaxy is influenced by various factors, including its initial motion, the distribution of matter in the universe, and the gravitational pull of other galaxies.