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- Currently, there are three main ways to measure the Hubble constant: by using astronomical measurements to look at objects nearby and see how fast they are moving; by using gravitational waves from collisions of black holes or neutron stars; or by measuring the light left over from the Big Bang, known as the cosmic microwave background.
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Oct 3, 2024 · Hubble constant, in cosmology, constant of proportionality in the relation between the velocities of remote galaxies and their distances. It expresses the rate at which the universe is expanding. It is denoted by the symbol H_0 and named in honor of American astronomer Edwin Hubble.
- The Editors of Encyclopaedia Britannica
Hubble's constant is approximately \(2.3\times 10^{-18}s^{-1}\) if the distance is in metres and the speed in metres per second. This relationship means that the...
In July 2019, astronomers reported that a new method to determine the Hubble constant, and resolve the discrepancy of earlier methods, has been proposed based on the mergers of pairs of neutron stars, following the detection of the neutron star merger of GW170817, an event known as a dark siren.
Jul 16, 2019 · The Planck measurements allow scientists to predict how the early universe would likely have evolved into the expansion rate astronomers can measure today. Scientists calculated a value of 67.4 km/sec/Mpc, in significant disagreement with the rate of 74.0 km/sec/Mpc measured with Cepheid stars.
Dec 3, 2019 · The Hubble constant is a unit that describes how fast the universe is expanding at different distances from a particular point in space. It is one of the keystones in our understanding of the...
Aug 28, 2018 · The Hubble Constant is the unit of measurement used to describe the expansion of the universe. The cosmos has been getting bigger since the Big Bang kick-started the growth about...
