Archive:Globulars in M31 - Revision history

wikademia>Wikademia: moved Globulars in M31 to Archive:Globulars in M31

2009-06-12T07:56:05Z

moved Globulars in M31 to Archive:Globulars in M31

← Older revision	Revision as of 07:56, 12 June 2009
(No difference)

wikademia>Wikademia: Text replace - 'w:' to 'Wikipedia:'

2009-04-11T18:16:23Z

Text replace - 'w:' to 'Wikipedia:'

← Older revision		Revision as of 18:16, 11 April 2009
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	[[Image:M31_Lanoue.png\|left\|thumb\|300 px]]		[[Image:M31_Lanoue.png\|left\|thumb\|300 px]]

	The first recorded observation of this object as a fuzzy patch was by the Persian astronomer, [[w:Abd al-Rahman al-Sufi\|Abd al-Rahman al-Sufi]]. The nature of this "little cloud" has been the source of speculations throughout history. The answer was partially revealed shortly after the invention of the telescope which allowed [[w:Simon Marius\|Simon Marius]] to study it in 1612.		The first recorded observation of this object as a fuzzy patch was by the Persian astronomer, [[Wikipedia:Abd al-Rahman al-Sufi\|Abd al-Rahman al-Sufi]]. The nature of this "little cloud" has been the source of speculations throughout history. The answer was partially revealed shortly after the invention of the telescope which allowed [[Wikipedia:Simon Marius\|Simon Marius]] to study it in 1612.

	As a nebulousity it was cataloged in the 19th century and many other similar 'spiral nebulas' were discovered.		As a nebulousity it was cataloged in the 19th century and many other similar 'spiral nebulas' were discovered.

	Photography institued a new era in the exploration of such objects and in 1917 [[w:Heber Curtis\|Heber Curtis]] noticed that nova from the distant object were 10 magnitudes fainter making the object 500,000 light-years away. He hypothesized that such objects were "island universes" and were large copies of the stars, dust and gas that we called the milky way.		Photography institued a new era in the exploration of such objects and in 1917 [[Wikipedia:Heber Curtis\|Heber Curtis]] noticed that nova from the distant object were 10 magnitudes fainter making the object 500,000 light-years away. He hypothesized that such objects were "island universes" and were large copies of the stars, dust and gas that we called the milky way.

	This remained controversial for a full decade, until [[w:Edwin Hubble\|Edwin Hubble]], using the large palomar telescope, resolved some of its variable stars. As the timing of changes in the variable star was conclusively related to its brightness, he was able to conclusively show that M31, was indeed far beyond this galaxy. We now know it to be 2.2 million light-years away.		This remained controversial for a full decade, until [[Wikipedia:Edwin Hubble\|Edwin Hubble]], using the large palomar telescope, resolved some of its variable stars. As the timing of changes in the variable star was conclusively related to its brightness, he was able to conclusively show that M31, was indeed far beyond this galaxy. We now know it to be 2.2 million light-years away.

	==A globular cluster==		==A globular cluster==

	[[Image:M80.jpg\|right\|thumb\|The globular cluster [[w:Messier 80\|M80]]]]		[[Image:M80.jpg\|right\|thumb\|The globular cluster [[Wikipedia:Messier 80\|M80]]]]

	A globular cluster is a very old and tightly bound group of stars. A globular cluster may have some million stars and therefore it shines very brightly. But on the other hand, globular clusters are found in the Halo around a galaxy and thus are much further away than many objects seen in the telescopes (galaxies being an obvious exception). The milky way galaxy has 158 known globular clusters, however many galaxies have far more. The Andromeda galaxy is suspected to have 500.		A globular cluster is a very old and tightly bound group of stars. A globular cluster may have some million stars and therefore it shines very brightly. But on the other hand, globular clusters are found in the Halo around a galaxy and thus are much further away than many objects seen in the telescopes (galaxies being an obvious exception). The milky way galaxy has 158 known globular clusters, however many galaxies have far more. The Andromeda galaxy is suspected to have 500.

wikademia>Wikademia at 04:49, 8 April 2009

2009-04-08T04:49:17Z

← Older revision		Revision as of 04:49, 8 April 2009
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	==M31, the Great Andomeda Galaxy==		==M31, the Great Andomeda Galaxy==
			{{ntnes}}
	[[Image:M31_Lanoue.png\|left\|thumb\|300 px]]		[[Image:M31_Lanoue.png\|left\|thumb\|300 px]]

wikademia>Wikademia at 21:51, 23 March 2009

2009-03-23T21:51:06Z

← Older revision		Revision as of 21:51, 23 March 2009
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	The following sketch was carefully made of all field stars I saw during a clear night with a 10" dobsonian. Two globulars are shown, a third was clearly missed (having a brightness similar to other observed field stars)		The following sketch was carefully made of all field stars I saw during a clear night with a 10" dobsonian. Two globulars are shown, a third was clearly missed (having a brightness similar to other observed field stars)

	~~[[Image:102308 globM31.jpg\|center\|400 px]]~~

	Please feel free to attach any sketches of images which capture M31 globulars.		Please feel free to attach any sketches of images which capture M31 globulars.

	[[Category:~~Amateur astronomy~~]]		[[Category:Astronomy]]

wikademia>Wikademia at 11:33, 23 March 2009

2009-03-23T11:33:16Z

← Older revision		Revision as of 11:33, 23 March 2009
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	==M31, the Great Andomeda Galaxy==		==M31, the Great Andomeda Galaxy==

	[[Image:M31_Lanoue.png\|left\|300 px]]		[[Image:M31_Lanoue.png\|left\|thumb\|300 px]]

	The first recorded observation of this object as a fuzzy patch was by the Persian astronomer, [[w:Abd al-Rahman al-Sufi\|Abd al-Rahman al-Sufi]]. The nature of this "little cloud" has been the source of speculations throughout history. The answer was partially revealed shortly after the invention of the telescope which allowed [[w:Simon Marius\|Simon Marius]] to study it in 1612.		The first recorded observation of this object as a fuzzy patch was by the Persian astronomer, [[w:Abd al-Rahman al-Sufi\|Abd al-Rahman al-Sufi]]. The nature of this "little cloud" has been the source of speculations throughout history. The answer was partially revealed shortly after the invention of the telescope which allowed [[w:Simon Marius\|Simon Marius]] to study it in 1612.

wikademia>Wikademia: 16 revisions

2009-03-23T11:24:09Z

16 revisions

← Older revision	Revision as of 11:24, 23 March 2009
(No difference)

wikademia>Mu301: /* Observing globulars in M31 */ new cat

2008-11-05T14:40:36Z

Observing globulars in M31: new cat

← Older revision		Revision as of 14:40, 5 November 2008
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	Please feel free to attach any sketches of images which capture M31 globulars.		Please feel free to attach any sketches of images which capture M31 globulars.

	[[Category:~~Astronomy~~]]		[[Category:Amateur astronomy]]

wikademia>Mu301: /* Observing globulars in M31 */ copyedit

2008-10-27T09:11:10Z

Observing globulars in M31: copyedit

← Older revision		Revision as of 09:11, 27 October 2008
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	==Observing globulars in M31==		==Observing globulars in M31==
	It is amazing to see ~~anystar~~ groups ~~2million~~ light years away, yet nevertheless globular clusters are a definite (but demanding observing target for a 10" reflecting telescope). At this distance, all ~~sence~~ of it being a cluster is lost and it shines as one of M31 brighter stars. While some maps show many hundreds, many of which can be imaged with modest equiptment. the limit for a 10" scope is somewhere around 6-12.		It is amazing to see any star groups 2 million light-years away, yet nevertheless globular clusters are a definite (but demanding observing target for a 10" reflecting telescope). At this distance, all sense of it being a cluster is lost and it shines as one of M31 brighter stars. While some maps show many hundreds, many of which can be imaged with modest equiptment, the limit for a 10" scope is somewhere around 6-12.

			The following sketch was carefully made of all field stars I saw during a clear night with a 10" dobsonian. Two globulars are shown, a third was clearly missed (having a brightness similar to other observed field stars)

	The following sketch was carefully made of all field stars I saw during a clear night with a 10" dobsonian. two globulars are shown, a third was clearly missed (having a brightness similar to other observed field stars)
	[[Image:102308 globM31.jpg\|center\|400 px]]		[[Image:102308 globM31.jpg\|center\|400 px]]

	~~please~~ feel free to attach any sketches of images which capture M31 globulars.		Please feel free to attach any sketches of images which capture M31 globulars.

	[[Category:Astronomy]]		[[Category:Astronomy]]

wikademia>Mu301: /* A globular cluster */

2008-10-27T09:01:37Z

A globular cluster

← Older revision		Revision as of 09:01, 27 October 2008
Line 12:		Line 12:

	==A globular cluster==		==A globular cluster==
	A globular cluster is a very old and tightly bound group of stars. ~~[[Image:M80.jpg\|left\|200 px]]~~ A globular cluster may have ~~seem~~ million stars and therefore ~~shine~~ very brightly. But on the other hand, globular clusters are found in the Halo around a galaxy and thus are much further away than many objects seen in the telescopes (galaxies being an obvious exception). The milky way galaxy has 158 known globular clusters, however many galaxies have far more. The Andromeda galaxy is suspected to have 500.
			[[Image:M80.jpg\|right\|thumb\|The globular cluster [[w:Messier 80\|M80]]]]

			A globular cluster is a very old and tightly bound group of stars. A globular cluster may have some million stars and therefore it shines very brightly. But on the other hand, globular clusters are found in the Halo around a galaxy and thus are much further away than many objects seen in the telescopes (galaxies being an obvious exception). The milky way galaxy has 158 known globular clusters, however many galaxies have far more. The Andromeda galaxy is suspected to have 500.

	==Observing globulars in M31==		==Observing globulars in M31==

wikademia>Mu301: /* M31, the Great Andomeda Galaxy */ copyedit

2008-10-27T08:58:54Z

M31, the Great Andomeda Galaxy: copyedit

← Older revision		Revision as of 08:58, 27 October 2008
Line 1:		Line 1:
	==M31, the Great Andomeda Galaxy==		==M31, the Great Andomeda Galaxy==
	[[Image:M31_Lanoue.png\|left\|300 px]]First noticed as a fuzzy patch by the Persian Astronomer, Abd al-Sufi. The nature of this "little cloud" has been the source of speculations throughout history. The answer was partially revealed shortly after the invention of the telescope which allowed Simon Marius to study it in 1612.

	~~As nebulousity was cataloged in the 19th century many other similar 'spiral nebulas' were discovered~~.		[[Image:M31_Lanoue.png\|left\|300 px]]

	~~Photography institued a new era in the exploration~~ of ~~such objects and in 1917 Heber Curtis noticed that nova from the distant~~ object ~~were 10 magnitudes fainter making~~ the ~~object 500~~,~~000 lightyears away~~. ~~He hypothesized that such object were~~ "~~island universes~~" ~~and were large copies~~ of the ~~stars, dust and gas that we called~~ the ~~milky way~~.		The first recorded observation of this object as a fuzzy patch was by the Persian astronomer, [[w:Abd al-Rahman al-Sufi\|Abd al-Rahman al-Sufi]]. The nature of this "little cloud" has been the source of speculations throughout history. The answer was partially revealed shortly after the invention of the telescope which allowed [[w:Simon Marius\|Simon Marius]] to study it in 1612.

	This remained controversial for a full decade, until Edwin Hubble, using the large palomar telescope, resolved some of its variable stars. As the timing of changes in the variable star was conclusively related to its brightness, he was able to conclusively show that M31, was indeed far beyond this galaxy. We now know it to be 2.2 million light years away.		As a nebulousity it was cataloged in the 19th century and many other similar 'spiral nebulas' were discovered.

			Photography institued a new era in the exploration of such objects and in 1917 [[w:Heber Curtis\|Heber Curtis]] noticed that nova from the distant object were 10 magnitudes fainter making the object 500,000 light-years away. He hypothesized that such objects were "island universes" and were large copies of the stars, dust and gas that we called the milky way.

			This remained controversial for a full decade, until [[w:Edwin Hubble\|Edwin Hubble]], using the large palomar telescope, resolved some of its variable stars. As the timing of changes in the variable star was conclusively related to its brightness, he was able to conclusively show that M31, was indeed far beyond this galaxy. We now know it to be 2.2 million light-years away.

	==A globular cluster==		==A globular cluster==