Imagine you were a scientist attempting to measure some property of the Universe. If you’re curious about the way anything works, you’ll have to find a way to infer not only what’s occurring, but in what amount. This is a difficult task; you want not only the qualitative answer to the question of what’s happening, but the quantitative part as well, answering the question of “by how much?”
In cosmology, one of the great challenges is to measure the expansion of the Universe. We’ve known since the 1920s that the Universe is expanding, although it’s been a quest for the generations to determine “by how much?” There are a number of different groups today using a multitude of different techniques to measure exactly that. The answers they get consistently fall into one of two categories, but are incompatible with each other. Here’s how we plan to solve this conundrum.