Is it really true that ... ... two galaxies can move away from each other at the speed of light?

Are galaxies travelling so fast that the distance between them is expanded faster than at the speed of light?

Two galaxies can move away from each other so rapidly that it looks as if they are travelling faster than light. But it is not the galaxies that are in a hurry, it is the expanding universe which is increasing the distance between galaxies.

The space in between these (and every) galaxy is expanding like the rest of the universe. If two galaxies are located more than about 14 billion light years from each other, the distance between them is growing so rapidly that light cannot follow suit.

Such galaxies can no longer be observed. The light that they emit will never reach us, because space is expanding too fast for the light to keep up.