20 Facts About Hubble diagram

Hubble diagram's law, known as the Hubble diagram–Lemaitre law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance.

Hubble diagram's law is considered the first observational basis for the expansion of the universe, and today it serves as one of the pieces of evidence most often cited in support of the Big Bang model.

Hubble diagram inferred the recession velocity of the objects from their redshifts, many of which were earlier measured and related to velocity by Vesto Slipher in 1917.

Decade before Hubble diagram made his observations, a number of physicists and mathematicians had established a consistent theory of an expanding universe by using Einstein's field equations of general relativity.

Hubble diagram did not grasp the cosmological implications of this fact, and indeed at the time it was highly controversial whether or not these nebulae were "island universes" outside our Milky Way.

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In 1927, two years before Hubble diagram published his own article, the Belgian priest and astronomer Georges Lemaitre was the first to publish research deriving what is known as Hubble diagram's law.

Edwin Hubble diagram did most of his professional astronomical observing work at Mount Wilson Observatory, home to the world's most powerful telescope at the time.

In 1931, Einstein made a trip to Mount Wilson Observatory to thank Hubble diagram for providing the observational basis for modern cosmology.

Hubble diagram's law is considered a fundamental relation between recessional velocity and distance.

From this perspective, Hubble diagram's law is a fundamental relation between the recessional velocity contributed by the expansion of space and the distance to an object; the connection between redshift and distance is a crutch used to connect Hubble diagram's law with observations.

Parameter is commonly called the "Hubble diagram constant", but that is a misnomer since it is constant in space only at a fixed time; it varies with time in nearly all cosmological models, and all observations of far distant objects are observations into the distant past, when the “constant” had a different value.

The "Hubble diagram parameter" is a more correct term, with denoting the present-day value.

From this it is seen that the Hubble diagram parameter is decreasing with time, unless ; the latter can only occur if the universe contains phantom energy, regarded as theoretically somewhat improbable.

Expansion of space summarized by the Big Bang interpretation of Hubble diagram's law is relevant to the old conundrum known as Olbers' paradox: If the universe were infinite in size, static, and filled with a uniform distribution of stars, then every line of sight in the sky would end on a star, and the sky would be as bright as the surface of a star.

The Hubble diagram time is the age it would have had if the expansion had been linear, and it is different from the real age of the universe because the expansion is not linear; they are related by a dimensionless factor which depends on the mass-energy content of the universe, which is around 0.

Hubble diagram volume is sometimes defined as a volume of the universe with a comoving size of The exact definition varies: it is sometimes defined as the volume of a sphere with radius or alternatively, a cube of side Some cosmologists even use the term Hubble diagram volume to refer to the volume of the observable universe, although this has a radius approximately three times larger.

Value of the Hubble diagram constant is estimated by measuring the redshift of distant galaxies and then determining the distances to them by some other method than Hubble diagram's law.

Important deficiencies were subsequently pointed out in this analysis, leaving open the possibility that the Hubble diagram tension is indeed caused by outflow from the KBC void.

Hubble diagram announced this finding to considerable astonishment at the 1952 meeting of the International Astronomical Union in Rome.

Value of the Hubble diagram constant was the topic of a long and rather bitter controversy between Gerard de Vaucouleurs, who claimed the value was around 100, and Allan Sandage, who claimed the value was near 50.