The Redshift conjecture is a hypothesis in the field of astrophysics, particularly related to the study of galaxies and cosmic structures. The conjecture posits that the observed redshift of galaxies is primarily due to the expansion of the universe rather than a simple Doppler effect from motion through space. In essence, it suggests that the redshift is linked to the fabric of spacetime expanding, which stretches the light waves traveling through it, leading to an increase in their wavelength (redshift).
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