The Hubble constant, within cosmological research, denotes the present-day proportionality factor relating the recession velocity of extragalactic objects to their proper distance in the expanding universe, and thus operationally defines the local expansion rate. As a research area, work on the Hubble constant encompasses precision measurement via distance-ladder methods (e.g., Cepheids, Type Ia supernovae), early-universe inferences from cosmic microwave background anisotropies and baryon acoustic oscillations, and associated statistical and systematic error analyses. This field currently focuses on resolving tensions between independent determinations, refining calibration strategies, and constraining cosmological models and new physics through improved estimates of this parameter.
We've known the universe is expanding for a long time. The first solid paper demonstrating cosmic expansion was published by Edwin Hubble in 1929, based on observations made by Vesto Slipher, Milton Humason, and Henrietta ...
Astronomy
Oct 4, 2024
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Measuring the Hubble constant, the rate at which the universe is expanding, is an active area of research among astronomers around the world who analyze data from both ground- and space- based observatories. NASA's James ...
Astronomy
Oct 1, 2024
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The idea that the universe is expanding dates from almost a century ago. It was first put forward by Belgian cosmologist Georges Lemaître (1894–1966) in 1927 and confirmed observationally by American astronomer Edwin Hubble ...
General Physics
Apr 15, 2024
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