Cosmology Crisis Cleared identifies the fundamental mistake causing the failure of cosmologists to agree on a value for Hubble's Constant, which is the most important constant in cosmology. After 80 years of trying, this is a crisis. To clear this crisis in cosmology: Astronomers must recognize every galaxy and quasar has its velocity measured incorrectly. This is because they are measured just like a star in the Milky Way. The velocity of a galaxy or quasar CANNOT be measured in a spectrum like a star. The 3 spectra are too different. Only a star of the 3 has a photosphere surface for attaching atoms. Also, protons can be superluminal, but not galaxies and quasars. Every z>1 is the proton's velocity when capturing an electron to form an atom. .I can explain why the method being used since the first redshift measurement in 1912 is wrong. Unfortunately, its use persists to this day. That is the main reason why the crisis cannot be resolved. Calculating Hubble's Constant requires consistent velocities. The respective methods for distance calculations (like from from Cepheid or luminosity or others), or for alternate redshifts (not from spectra) are evaluated.The book analyzed over 600 galaxies. Many galaxies have their spectra presented to reveal the process of obtaining their velocity and distance..The consequences of this measurement mistake on cosmology are severe. The velocity values drive many theories, so they must be revised after getting correct velocity measurements. Among the theories affected are the universe expansion and the big bang.