Measurements of pretty much any time in the universe can test predictions made by models of the early universe. One of the main reasons we think there was infla

Measurements of pretty much any time in the universe can test predictions made by models of the early universe. One of the main reasons we think there was inflation is from late time (near today) observations of matter density (see https://en.wikipedia.org/wiki/Flatness_problem https://en.wikipedia.org/wiki/Flatness_problem).