Hubble constant - Revision history

DavidB4-bot: /* top */Spelling/Grammar Check, typos fixed: refered → referred, runing → running, the the → the

2016-07-20T17:25:53Z

top: Spelling/Grammar Check, typos fixed: refered → referred, runing → running, the the → the

DavidB4-bot: clean up & uniformity

2016-07-13T14:08:55Z

clean up & uniformity

AK: Adding See Also section

2014-03-02T14:23:35Z

Adding See Also section

FrederickT3: There's no c in the definition of H0

2011-11-27T19:58:56Z

There's no c in the definition of H0

SamRSC at 21:39, November 25, 2011

2011-11-25T21:39:45Z

JimJast at 20:43, September 18, 2011

2011-09-18T20:43:45Z

JimJast at 20:37, September 18, 2011

2011-09-18T20:37:29Z

JimJast: fixing grammar and style

2011-09-18T20:33:36Z

fixing grammar and style

JimJast at 20:31, September 18, 2011

2011-09-18T20:31:40Z

JimJast at 18:19, September 18, 2011

2011-09-18T18:19:44Z

@@ Line 9: / Line 9: @@
 where <math>R_E</math> is [[Einstein's radius of universe]]. Present observations indicate that the Hubble constant is about 70&nbsp;km/s/Mpc.
-The recessional velocity turned out not to be proportional to the distance though and so the '''Hubble constant''' is refered to the the nearest galaxies for which it may be considered to be relatively constant.
+The recessional velocity turned out not to be proportional to the distance though and so the '''Hubble constant''' is referred to the nearest galaxies for which it may be considered to be relatively constant.
-The [[Essay:Problems in Cosmology]] explains the possibility of the '''Hubble constant''' being a feature of universe that is stationary (neither expanding nor contracting) and the recessional velocity of galaxies being an illusion caused by the time runing slower at the deep space galaxies than in our Galaxy which mimics the accelerating expansion.
+The [[Essay:Problems in Cosmology]] explains the possibility of the '''Hubble constant''' being a feature of universe that is stationary (neither expanding nor contracting) and the recessional velocity of galaxies being an illusion caused by the time running slower at the deep space galaxies than in our Galaxy which mimics the accelerating expansion.
 The observations of [[cosmological redshift]]s are consistent with the universe being stationary and [[quasar]]s being local rather than remote objects as already suggested by [[Halton Arp]].<ref>

@@ Line 7: / Line 7: @@
 :<math>H_o=c/R_E</math>,
-where <math>R_E</math> is [[Einstein's radius of universe]]. Present observations indicate that the Hubble constant is about 70km/s/Mpc.
+where <math>R_E</math> is [[Einstein's radius of universe]]. Present observations indicate that the Hubble constant is about 70&nbsp;km/s/Mpc.
 The recessional velocity turned out not to be proportional to the distance though and so the '''Hubble constant''' is refered to the the nearest galaxies for which it may be considered to be relatively constant.
@@ Line 13: / Line 13: @@
 The [[Essay:Problems in Cosmology]] explains the possibility of the '''Hubble constant''' being a feature of universe that is stationary (neither expanding nor contracting) and the recessional velocity of galaxies being an illusion caused by the time runing slower at the deep space galaxies than in our Galaxy which mimics the accelerating expansion.
-The observations of [[cosmological redshift]]s are consistent with the universe being stationary and [[quasar]]s being local rather than remote objects as already suggested by [[Halton Arp]] <ref>
+The observations of [[cosmological redshift]]s are consistent with the universe being stationary and [[quasar]]s being local rather than remote objects as already suggested by [[Halton Arp]].<ref>
 Halton Arp, ''"Quasars, Redshifts and Controversies"'', 1987.
-</ref>.
+</ref>
-==See Also==
+==See also==
 *[[Hubble Law]]
@@ Line 24: / Line 24: @@
 <references/>
-[[Category: Astronomy]]
+[[Category:Astronomy]]
-[[category: Cosmology]]
+[[Category:Cosmology]]
-[[category: Physics]]
+[[Category:Physics]]

← Older revision		Revision as of 14:23, March 2, 2014
Line 18:		Line 18:

	</ref>.		</ref>.
		+	==See Also==
		+	*[[Hubble Law]]

	==References==		==References==

@@ Line 1: / Line 1: @@
-After astronomers realised that the universe is expanding they introduced the '''Hubble constant''' as the measure of speed of this expansion as a ratio of assumed recession velocity of galaxies to their distance. The '''Hubble constant''' equals approximately, for <math>v<<c</math>
+After astronomers realised that the universe is expanding they introduced the '''Hubble constant''' as the measure of speed of this expansion as a ratio of assumed recession velocity of galaxies to their distance. The '''Hubble constant''' equals approximately, for <math>v\ll c</math>
-:<math>H_o=v/c/r</math>,
+:<math>H_0=v/r</math>,
 where <math>v</math> is assumed speed of recession of a galaxy, <math>c</math>, speed of light in vacuum, combined with <math>v</math> producing ''"redshift"'' <math>Z=v/c</math>, and <math>r</math> is distance from the observer to the observed galaxy, and its exact value turned out to be

← Older revision		Revision as of 21:39, November 25, 2011
Line 1:		Line 1:
−	After astronomers ~~decided~~ that the universe ~~might be~~ expanding they introduced the '''Hubble constant''' as the measure of speed of this ~~hypotetical~~ expansion as a ratio of assumed recession velocity of galaxies to their distance. The '''Hubble constant''' equals approximately, for <math>v<<c</math>	+	After astronomers realised that the universe is expanding they introduced the '''Hubble constant''' as the measure of speed of this expansion as a ratio of assumed recession velocity of galaxies to their distance. The '''Hubble constant''' equals approximately, for <math>v<<c</math>

	:<math>H_o=v/c/r</math>,		:<math>H_o=v/c/r</math>,

@@ Line 13: / Line 13: @@
 The [[Essay:Problems in Cosmology]] explains the possibility of the '''Hubble constant''' being a feature of universe that is stationary (neither expanding nor contracting) and the recessional velocity of galaxies being an illusion caused by the time runing slower at the deep space galaxies than in our Galaxy which mimics the accelerating expansion.
-The observations of [[cosmological redshift]]s are consistent with the universe being stationary and [[quasars]] being local rather than remote objects as already suggested by [[Halton Arp]] <ref>Halton Arp, ''"Quasars, Redshifts and Controversies"'', 1987.</ref>.
+The observations of [[cosmological redshift]]s are consistent with the universe being stationary and [[quasar]]s being local rather than remote objects as already suggested by [[Halton Arp]] <ref>Halton Arp, ''"Quasars, Redshifts and Controversies"'', 1987.</ref>.
 ==References==

← Older revision		Revision as of 18:19, September 18, 2011
Line 1:		Line 1:
−	After astronomers decided that the universe might be expanding they introduced the '''Hubble constant''' as the measure of speed of this hypotetical expansion as a ratio of assumed recession velocity of galaxies to their distance. The '''Hubble constant''' equals approximately	+	After astronomers decided that the universe might be expanding they introduced the '''Hubble constant''' as the measure of speed of this hypotetical expansion as a ratio of assumed recession velocity of galaxies to their distance. The '''Hubble constant''' equals approximately, for <math>v<<c</math>

	:<math>H_o=v/c/r</math>,		:<math>H_o=v/c/r</math>,