Nemesis (Star) - Revision history

DavidB4-bot: /* Related Link */HTTP --> HTTPS [#1], replaced: http://www.youtube.com → https://www.youtube.com

2018-09-26T18:44:34Z

Related Link: HTTP --> HTTPS [#1], replaced: http://www.youtube.com → https://www.youtube.com

DavidB4-bot: clean up & uniformity

2016-07-13T16:32:44Z

clean up & uniformity

TerryH: /* Controversy */

2010-07-12T17:02:35Z

Controversy

TerryH at 02:30, June 11, 2008

2008-06-11T02:30:07Z

TerryH at 00:46, June 11, 2008

2008-06-11T00:46:48Z

TerryH: Expansion

2008-06-11T00:45:28Z

Expansion

Aziraphale: categorize

2007-08-01T15:46:24Z

categorize

BrianCo: update for navbox

2007-07-16T12:25:37Z

update for navbox

Fox: Nemesis(Star) moved to Nemesis (Star): naming convention

2007-07-06T09:43:34Z

Nemesis(Star) moved to Nemesis (Star): naming convention

Elamdri at 01:44, June 2, 2007

2007-06-02T01:44:51Z

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 {{reflist|2}}
 == Related Link ==
-* Muller, Richard A. "[http://www.youtube.com/watch?v=ERy-MTfgulc Physics 10 - Lecture 25: Universe II]" Department of Physics, [[University of California]], [[Berkeley]], [[California]], delivered May 4, 2006. Mentions Nemesis ''inter alia''.
+* Muller, Richard A. "[https://www.youtube.com/watch?v=ERy-MTfgulc Physics 10 - Lecture 25: Universe II]" Department of Physics, [[University of California]], [[Berkeley]], [[California]], delivered May 4, 2006. Mentions Nemesis ''inter alia''.
 == See also ==

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 == Physical characteristics ==
-Whitmire and Jackson have suggested that Nemesis would have a mass varying from 2 * 10<sup>-4</sup> to 7 * 10<sup>-2</sup> times the mass of the sun. This is the range of masses of brown or black dwarf stars. Muller has argued that the star is a somewhat hotter red dwarf, of magnitude between 7 and 12.<ref name=Muller/>
+Whitmire and Jackson have suggested that Nemesis would have a mass varying from 2 * 10<sup>−4</sup> to 7 * 10<sup>−2</sup> times the mass of the sun. This is the range of masses of brown or black dwarf stars. Muller has argued that the star is a somewhat hotter red dwarf, of magnitude between 7 and 12.<ref name=Muller/>
 == Controversy ==
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 == Search for Nemesis ==
-As mentioned, no one has yet seen Nemesis. A recent infrared survey of the sky failed to detect it.<ref name=Schlyter/> But at least two more wide-ranging surveys of the sky are planned, by the Panoramic Survey Telescope and Rapid Response System (Pan-Starrs)<ref name=PanStarrs>"[http://pan-starrs.ifa.hawaii.edu/public/ Pan-Starrs Home]."</ref> and the Large Synoptic Survey Telescope (LSST)<ref name=LSST>"[http://www.lsst.org/lsst_home.shtml LSST Home]."</ref><ref name=Muller/>
+As mentioned, no one has yet seen Nemesis. A recent infrared survey of the sky failed to detect it.<ref name=Schlyter/> But at least two more wide-ranging surveys of the sky are planned, by the Panoramic Survey Telescope and Rapid Response System (Pan-Starrs)<ref name=PanStarrs>"[http://pan-starrs.ifa.hawaii.edu/public/ Pan-Starrs Home]."</ref> and the Large Synoptic Survey Telescope (LSST)<ref name=Muller/><ref name=LSST>"[http://www.lsst.org/lsst_home.shtml LSST Home]."</ref>
 == References ==

← Older revision		Revision as of 17:02, July 12, 2010
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	However, even uniformitarian geologists do not necessarily accept the claimed periodicity of ELEs.<ref name=Britt/><ref name=Mukai/>		However, even uniformitarian geologists do not necessarily accept the claimed periodicity of ELEs.<ref name=Britt/><ref name=Mukai/>
		+
		+	=== Re-examination ===
		+	On 2 July 2010, Mellot and Barnbach published a study suggesting that the ELEs have occurred over 500 million years, during which galactic tides and encounters with passing stars should have perturbed the orbit of the hypothetical Nemesis, but did not. Therefore, they now say, such a star cannot be blamed for ELEs occurring regularly ever 26 million years.<ref name=Mellot>Mellot A and Barnbach RK, "Nemesis reconsidered", ''Solar and Stellar Astrophysics'', 2 July 2010. Accesssed 12 July 2010. {{arXiv\|1007.0437v1}}</ref>

	== A creationist perspective ==		== A creationist perspective ==

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 Muller has suggested that the Moon suffered a bombardment event as recently (per uniformitarian theories) as 400 to 600 million years ago, and that Nemesis might have been the cause.<ref name=MullerMoon>Muller, Richard A. "[http://muller.lbl.gov/papers/Lunar_impacts_Nemesis.pdf Measurement of the lunar impact record for the past 3.5 billion years, and implications for the Nemesis theory]." ''Geological Society of America'' Special Paper 356, pp 659-665 (2002). Accessed June 10, 2008.</ref> Yet no geologist has developed evidence for periodic bombardment of the Moon, in line with the alleged 12 ELEs on the earth.
-The orbit of Nemesis is unstable, and many astronomers hold that Nemesis should long ago have escaped the Sun's gravity. Muller disputes these claims and insists that Nemesis ought to remain a part of the solar system for another billion years.<ref name=Muller/>
+The orbit of Nemesis would be unstable, and many astronomers hold that Nemesis should long ago have escaped the Sun's gravity. Muller disputes these claims and insists that Nemesis ought to remain a part of the solar system for another billion years.<ref name=Muller/>
 Recently, Walter Cruttenden at the Binary Research Institute has decided that [[Sedna]], a [[scatter disk]] object, actually is in orbital resonance with Nemesis.<ref name=Cruttenden>Staff. "[http://www.spacedaily.com/reports/Evidence_Mounts_For_Companion_Star_To_Our_Sun.html Evidence Mounts For Companion Star To Our Sun]." ''SpaceDaily'', April 25, 2006. Accessed June 10, 2008.</ref> Sedna's sidereal year is estimated to be 12,000 Earth years. If Sedna is in resonance with Nemesis, then it would probably have an actual period of 13,000 years and be in a 20:1 resonance with the hypothetical star.

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 |discname=Richard A. Muller<ref name=Muller>Muller, Richard A., ed. "[http://muller.lbl.gov/pages/lbl-nem.htm Nemesis]." n.d. Accessed June 10, 2008.</ref>
 |origname=Greek goddess of retribution<ref name=Sasha>Author unknown. "[http://swanson.bol.ucla.edu/ The Nemesis Theory]." n.d. Accessed June 10, 2008.</ref>
 |primary=Sun
 |periapsis=8,800 AU<ref name=calc>Calculated</ref>

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-'''Nemesis''' is a theoretical [[dwarf star]] said to orbit the sun outside of the [[Oort Cloud]]. Some scientists believe that if Nemesis exists, it's passing by the [[Oort Cloud]] might send asteroids towards Earth. This hypothesis is sometimes used to back up the belief that the dinosaurs were killed by a large asteroid or meteor impact.
+{{Planet
 {{Solarsystem}}
+[[Category:Astronomy]]

← Older revision		Revision as of 15:46, August 1, 2007
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	'''Nemesis''' is a theoretical [[dwarf star]] said to orbit the sun outside of the [[Oort Cloud]]. Some scientists believe that if Nemesis exists, it's passing by the [[Oort Cloud]] might send asteroids towards Earth. This hypothesis is sometimes used to back up the belief that the dinosaurs were killed by a large asteroid or meteor impact.		'''Nemesis''' is a theoretical [[dwarf star]] said to orbit the sun outside of the [[Oort Cloud]]. Some scientists believe that if Nemesis exists, it's passing by the [[Oort Cloud]] might send asteroids towards Earth. This hypothesis is sometimes used to back up the belief that the dinosaurs were killed by a large asteroid or meteor impact.


	{{Solarsystem}}		{{Solarsystem}}
		+
		+	[[category:astronomy]]

← Older revision		Revision as of 12:25, July 16, 2007
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		+
		+	'''Nemesis''' is a theoretical [[dwarf star]] said to orbit the sun outside of the [[Oort Cloud]]. Some scientists believe that if Nemesis exists, it's passing by the [[Oort Cloud]] might send asteroids towards Earth. This hypothesis is sometimes used to back up the belief that the dinosaurs were killed by a large asteroid or meteor impact.
		+
		+
	{{Solarsystem}}		{{Solarsystem}}
−	'''Nemesis''' is a theoretical [[dwarf star]] said to orbit the sun outside of the [[Oort Cloud]]. Some scientists believe that if Nemesis exists, it's passing by the [[Oort Cloud]] might send asteroids towards Earth. This hypothesis is sometimes used to back up the belief that the dinosaurs were killed by a large asteroid or meteor impact.

← Older revision	Revision as of 09:43, July 6, 2007
(No difference)

← Older revision		Revision as of 01:44, June 2, 2007
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		+	{{Solarsystem}}
	'''Nemesis''' is a theoretical [[dwarf star]] said to orbit the sun outside of the [[Oort Cloud]]. Some scientists believe that if Nemesis exists, it's passing by the [[Oort Cloud]] might send asteroids towards Earth. This hypothesis is sometimes used to back up the belief that the dinosaurs were killed by a large asteroid or meteor impact.		'''Nemesis''' is a theoretical [[dwarf star]] said to orbit the sun outside of the [[Oort Cloud]]. Some scientists believe that if Nemesis exists, it's passing by the [[Oort Cloud]] might send asteroids towards Earth. This hypothesis is sometimes used to back up the belief that the dinosaurs were killed by a large asteroid or meteor impact.