Re-estimation of the Hubble’s Constant Based on Analyzing Other Cosmological Parameters and Intergalactic Parallax Ranging

The Hubble’s constant is one of the most important cosmological parameters in the theoretical framework of the widely accepted ΛCDM model, which is key in determining many other cosmological parameters (e.g., the age, ultimate fate, and observable radius of the universe). However, the value of the Hubble’s constant is disputed between studies employing different methods to estimate the value of the Hubble’s constant, causing a crisis in cosmology and also casting doubt on the compatibility of the ΛCDM model. Therefore, this study aims to propose new methods to re-estimate the value of the Hubble’s constant at the present epoch with greater reliability and accuracy. Specifically, 2 methods are proposed for the re-estimation of the Hubble’s constant: (1) deriving an equation from pre-established formulae in cosmology that describes the mathematical relation between the Hubble’s constant and other known cosmological parameters; (2) sending a medium-sized space telescope to interstellar space to enable parallax ranging of other galaxies. The former method yielded a result of , which is comparable to results of other studies. Using mathematical deduction, this study verified the estimations for the value of the Hubble’s constant by previous attempts. Moreover, this study also proposes an explanation for the yet unexplained discrepancy in the Hubble’s constant’s value between different methods of measurement. The results of the study provide new outlooks to the methods of estimating the Hubble’s constant, and possibly inspiring projects to send space telescopes for intergalactic parallax ranging.