[Zeppo]

WMAP also measured variations in the cosmic microwave background so huge that they stretch across the entire sky.

OK, what on Earth (excuse the pun) is that supposed to mean? Variations so huge that they what?

[RightWhale]

supposed to mean

The meaning is for cosmologists to discover. What it is, is that the structures, which appear to be 14 billion light years away, go all the way from one side of the sky to the other, that is, they are 28 billion light years long.