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  1. Copilot 答案

    The scale factor is monotonically increasing as time passes. Thus z is positive, close to zero for local stars, ... Comoving distance and lookback time for the Planck 2018 cosmology parameters, from redshift 0 to 15, with distance (blue solid line) on the left axis, and time (orange dashed line) on the right. Note that the time that has passed ... 展开

    Overview

    In physics, a redshift is an increase in the wavelength, and corresponding decrease in the frequency and photon energy, of electromagnetic radiation (such as light). The opposite change, a decrease in wavelength and i… 展开

    History

    The history of the subject began in the 19th century, with the development of classical wave mechanics and the exploration of phenomena which are associated with the Doppler effect. The effect is named after the … 展开

    Measurement, characterization, and interpretation

    The spectrum of light that comes from a source (see idealized spectrum illustration top-right) can be measured. To determine the redshift, one searches for features in the spectrum such as absorption lines, emission lines, … 展开

    What happens if the cosmological principle fails?
    If the cosmological principle fails (see Lambda-CDM model § Violations of the cosmological principle), then the existing interpretations of the Hubble constant and the Hubble tension have to be revised, which might resolve the Hubble tension.
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    Overview
    History
    Measurement, characterization, and interpretation
    What happens if the cosmological principle fails?