 The development of a precise cosmological model compatible with the rich set of cosmological data currently available is an impressive achievement. Cosmology clearly relies very heavily on theory; the cosmological parameters that have been the target of observational campaigns are only defined given a background model. The strongest case for accepting the SM rests on the evidence in favor of the underlying physics, in concert with the overdetermination of cosmological parameters. The SM includes several free parameters, such as the density parameters characterizing the abundance of different types of matter, each of which can be measured several  ways.[14]  These methods have distinctive theoretical assumptions and sources of error. For example, the abundance of deuterium produced during big bang nucleosynthesis depends sensitively on the baryon density. Nucleosynthesis is described using well-tested nuclear physics, and the light element abundances are frozen in within the “first three minutes”. The amplitudes of the acoustic peaks in the CMB angular power spectrum depend on the baryon density at the time of decoupling. Current measurements fix the baryon density to an accuracy of one percent, and the values determined by these two methods agree within observational error. This agreement is one of many consistency checks for the  SM.[15]  There are important discrepancies, such as that between local versus global measurements of the Hubble parameter \(H_0\) (Luković et al. 2016; Bernal et al. 2016). The significance and further implications of these discrepancies is not clear.