Is There a Cosmic Triangle?

The oldest light in the universe is a really helpful resource for this. We can kind of put it together in a sort of cosmic triangle to get a sense for whether the universe is curved or flat bright. What we look for is the size of lumps that are evidenced in the cosmic makaray background light. And you can tell from the s that the wiggles of the does this lightor we do, as we look this light for lumps.