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en.wikipedia.org/wiki/Galaxy_rotation_curve

It is typically rendered graphically as a plot, and the data observed from each side of a spiral galaxy are generally asymmetric, so that data from each side are averaged to create the curve. A significant discrepancy exists between the experimental curves observed, and a curve derived from theory. The theory of dark matter ...

phys.org/news/2016-09-spiral-irregular-galaxies-current-dark.html

Sep 21, 2016 ... An astrophysicist who reviewed the study said the findings may lead to a new understanding of internal dynamics of galaxies. "Galaxy rotation curves have traditionally been explained via an ad hoc hypothesis: that galaxies are surrounded by dark matter," said David Merritt, professor of physics and ...

www.astronomy.ohio-state.edu/~pogge/Ast162/Unit6/dark.html

Mar 5, 2006 ... Dark Matter: Matter we cannot see directly: Detected only by its gravity: Most of the matter in the Universe? ... Subsequent observations have demonstrated that galaxy clusters are 90-99% dark matter. ... Dark Matter: Wdm: Dark Matter: 26%: Based on Galaxy Rotation Curves & Galaxy Cluster dynamics.

answersingenesis.org/astronomy/cosmology/case-for-dark-matter

Mar 22, 2017 ... We ought not to dismiss the observational science for dark matter over fears of the misuse of dark matter in historical science. ... the galaxies within the clusters. Shortly thereafter, rotation curves of individual spiral galaxies indicated the same thing may be true of galaxies in general. Both lines of evidence ...

www.sciencedaily.com/releases/2016/09/160921085052.htm

Sep 21, 2016 ... "Galaxy rotation curves have traditionally been explained via an ad hoc hypothesis: that galaxies are surrounded by dark matter," said David Merritt, professor of physics and ... "In our case, we find a relation between what you see in normal matter in galaxies and what you get in their gravity," McGaugh said.

www.universetoday.com/91520/astronomy-without-a-telescope-could-dark-matter-not-matter

Dec 3, 2011 ... The rotation curve of the Andromeda Galaxy - actual (white line) and rotational velocities of outer stars that would be expected based on the estimated mass of visible matter in the galaxy. From this we conclude up to 90% of the mass must be in the form of dark matter. Dark Matter, galaxies ...

www.flashcardmachine.com/1029.html

Apr 16, 2013 ... in order for gravitational lensing of a distant quasar to occur, the galaxy producing the lensing must ... based on galactic rotation curves and cluster dynamics, we think dark matter ... the type of radio galaxy that reveals its motion through the intergalactic medium is called ...

arxiv.org/pdf/1605.04909

May 24, 2016 ... clusters by Fritz Zwicky in the 1930s and on galactic rotation curves by Vera Rubin in the ... We then discuss the theories that have been put forward to explain the nature of dark matter, in terms of fundamental particles (Chapter V), astrophysical objects ... non-Newtonian gravity or dynamics (Chapter VII).

www.scribd.com/document/54676302/SuppQsFinalExamAstro320Spring08

1) Based on galactic rotation curves and cluster dynamics, we think dark matter: A) does not exist. B) is a very minor component on the total mass of the universe. C) is best detected by X-rays in intracluster gas clouds. D) comprises about 90% of the entire mass of the universe. E) exists, but has no observable effect on the ...