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Topic: Hubble Flow

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  Hubble's law - Wikipedia, the free encyclopedia
Hubble's law is the statement in physical cosmology that the redshift in light coming from distant galaxies is proportional to their distance.
Though there was considerable scatter (now known to be due to peculiar velocities), Hubble was able to plot a trend line from the 46 galaxies he studied and obtained a value for the Hubble constant of 500 km/s/Mpc, which is much higher than the currently accepted value due to errors in his distance calibrations.
The value of the Hubble constant was the topic of a long and rather bitter controversy between GĂ©rard de Vaucouleurs who claimed the value was 80 and Allan Sandage who claimed the value was 40.
en.wikipedia.org /wiki/Hubble_flow   (1979 words)

That is, we should be in the ‘Hubble flow’ for at least this number of collisions and above.
According to this tired light theory the Hubble constant H can be thought of as a measure of the electron density of intergalactic space, n.
To show an expanding universe, galaxies have to be in the ‘Hubble flow” and it is known that this starts at about 6 or 7 million light year away (some say 50 million light years away).
www.lyndonashmore.com /Hubbleflow.html   (1060 words)

 Astronomy courses / Tähtitieteen kurssit
Edwin Hubble discovered the expansion of the Universe in the 1920s, by measuring the speeds at which galaxies at a range of distances from the Milky Way were moving.
Instead, in galaxies around us, the Hubble flow is seen starting from about 1-2 Mpc (3 to 6 million light years) away and is seen, onwards and outwards, as far as one cares to look.
This means the the Hubble flow can be recognised at rather short distances from small groups, and makes the scatter around the flow small as well.
www.astro.utu.fi /tuorla/new/darkenergy.shtml   (781 words)

 The Bruce Medalists: Edwin Hubble
His investigation of these and similar objects, which he called extragalactic nebulae and which astronomers today call galaxies, led to his now-standard classification system of elliptical, spiral, and irregular galaxies, and to proof that they are distributed uniformly out to great distances.
(He had earlier classified galactic nebulae.) Hubble measured distances to galaxies and with Milton L. Humason extended Vesto M. Slipher’s measurements of their redshifts, and in 1929 Hubble published the velocity-distance relation which, taken as evidence of an expanding Universe, is the basis of modern cosmology.
Christianson, Gale E., Edwin Hubble: Mariner of the Nebulae (Farrar, Straus & Giroux, 1995, Univ. of Chicago Press, 1996).
phys-astro.sonoma.edu /BruceMedalists/Hubble/Hubble.html   (424 words)

 Hubble flow
The Hubble Constant: A Summary of the HST Program for the Luminosity Calibration of Type Ia Supernovae by Means of Cepheids
Clearly a strong motive to further reduce the systematic error of H0 by conventional means comes from the desire to use the Hubble constant itself as a reliable prior for the interpretation of the CMB spectrum.
A value of H0 = 62.3 corresponds in an Omega[M] = 0.3 and Omega[lambda] = 0.7 universe to an expansion age of 15.1 Gyr, which may be compared with the age of M92 of 13.5 Gyr (VandenBerg et al.
www.physicsforums.com /showthread.php?t=115674   (792 words)

 Hubble law concept from the Astronomy knowledge base   (Site not responding. Last check: 2007-10-13)
Hubble law concept from the Astronomy knowledge base
Galaxies moving away from us with a speed precisely following this relation are said to follow the Hubble flow.
Because the actual universe is not precisely homogeneous, with lumpiness arising from clustering of galaxies and voids of empty space, the motions of actual galaxies deviate somewhat from the Hubble flow.
www.site.uottawa.ca:4321 /astronomy/Hubblelaw.html   (117 words)

 Local effects of Hubble flow
It should run for as long as it takes for the Hubble flow to move the end of the beam off of the detector.
Otherwise we wouldn't be able to detect Hubble flow.
Or that space does expand locally in which case there may be some way to measure the effects of Hubble flow locally.
www.physicsforums.com /showthread.php?t=99140   (1751 words)

 Hubble flow
It occurs radially away from the observer and obeys the Hubble law.
Galaxies can overcome this expansion on scales smaller than that of clusters of galaxies.
The clusters, however, are being forever driven apart by the Hubble flow.
www.daviddarling.info /encyclopedia/H/Hubble_flow.html   (125 words)

 Hubble flow concept from the Astronomy knowledge base   (Site not responding. Last check: 2007-10-13)
Hubble flow concept from the Astronomy knowledge base
physical phenomena > process > physical process > motion > mass motion > galaxy motion > Hubble flow
Next galaxy motion: large-scale motions Up: galaxy motion Previous galaxy motion: galactic rotation
www.site.uottawa.ca:4321 /astronomy/Hubbleflow.html   (56 words)

 The Hubble Flow and Cosmological Considerations
If we consider a dust filled universe, with no density gradients in
, we ought to be able to approximate the observed Hubble flow in a simple fashion.
The repelling field on a shell of material, due to the presence of
www.physics.rutgers.edu /~matilsky/gravity/node4.html   (210 words)

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