How old is the universe?

 How old are the oldest galaxies? One of the surprises from the JWST is the discovery that 11 billion years ago, spiral galaxies had already formed.

We didn't think they could form that quickly. This article has a wealth of pictures.

Spiral galaxies contain bars, which are incredibly active stellar nurseries. Which means stars formed faster than we thought.

This might mean the universe is younger than we guessed. Or older. Either way, we need to rework our models of galaxy evolution.