The Universe Never Expands Faster Than the Speed of Light

Sean Carroll explains why superluminal expansion of the universe isn't even a meaningful concept:

"The expansion of the universe doesn’t have a “speed.” Really the discussion should begin and end right there. Comparing the expansion rate of the universe to the speed of light is like comparing the height of a building to your weight. You’re not doing good scientific explanation; you’ve had too much to drink and should just go home."