Or 156 billion light years across...

BBC NEWS | Science/Nature | Astronomers size up the Universe

Curiously, the number from the previous post is exactly half of this one. Reporting error? Someone mixing up diameter and radius??

Defining the edge of forever

Cool title, no? But can I back that up?

Universe very big: official | The Register

78 billion light years across (at least). Sheesh, now we'll definitely need a wormhole...
or an Improbabilty Drive...
or a police box...