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Spiral galaxy

en.wikipedia.org/wiki/Spiral_galaxy

A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 ... found in low-density regions and are rare in the centers of galaxy clusters. ... blue stars (due to t...

Chapter 25 - Astronomy 107 with N/a at St. Cloud State University ...

www.studyblue.com/notes/note/n/chapter-25/deck/6530159

May 2, 2013 ... Based on galactic rotation curves and cluster dynamics, we think dark matter ... Due to the galaxy density and collisions, ______ are rare in the ...

Galaxies - Astronomy Notes

www.astronomynotes.com/galaxy/s10.htm

May 1, 2013 ... This explains why galaxies are grouped in clusters and even clusters ... the elliptical galaxies while the lower density concentrations would ... stars that star- star collisions are very rare when the galaxies collide. ... found close to the centers of galaxies were formed from the collision and merging of galaxies.

NASA's Great Observatories Weigh Massive Young Galaxy Cluster ...

www.nasa.gov/mission_pages/chandra/nasas-great-observatories-weigh-massive-young-galaxy-cluster.html

Jan 7, 2016 ... This rare cluster, which is located 10 billion light years from Earth, weighs as much as 500 trillion Suns. ... NASA's Marshall Space Flight Center in Huntsville, Alabama, ... For more Chandra images, multimedia and related materials, visit: ..... This change in density is most likely caused by a collision between ...

The Galactic Center Massive Black Hole and Nuclear Star Cluster

arxiv.org/pdf/1006.0064

black holes, with the Galactic Center nuclear star cluster and cusp as the most .... projected radial motion on the sky (jz = 0) can be due to either true 3D radial .... The stellar surface density distribution of the stars in the clockwise disk is fairly ..... If the 'heavy' stars (mass mh,number Nh) are rare while the 'lig...

Relaxation and tidal stripping in rich clusters of galaxies. II. Evolution ...

adsabs.harvard.edu/full/1984ApJ...276...26M

The cluster core radius R~ and central density Po are related by Po .... for the very luminous cD galaxies sometimes seen at the centers of rich clusters. ... Edmunds (1973) showed that collisions between galaxies in the Coma Cluster are rare ...

Surprising black-hole discovery changes picture of globular star ...

phys.org/news/2012-10-black-hole-discovery-picture-globular-star.html

Oct 3, 2012 ... They hoped to find evidence for a rare type of black hole in the cluster's center. They wanted to find what scientists call an intermediate-mass ...

Astronomers image rare stellar cluster Liller 1 - Phys.org

phys.org/news/2015-06-astronomers-image-rare-stellar-cluster.html

Jun 17, 2015 ... The cluster of stars, known as Liller 1, is a difficult target to study due to its distance and also because it is located close to the center of the Milky ... Liller 1 is one of the best environments in our galaxy for stellar collisions." ..... STAR ( degenerate matter which has not collapsed to 'infinite densi...

X-ray discovery of a dwarf-galaxy galaxy collision Abstract - arXiv.org

arxiv.org/pdf/1308.0728

density of any gas associated with the cluster must be extremely low (<10-4 ... The center of the collision is about 4.3 kpc from the center of NGC 1232. ... diffuse emission in other spirals, making it unlikely that this emission is due to star formation regions that often ..... Such collisions are probably rare in the current epoc...

Gravity, Part 4: Globular Clusters & Galaxies. - University of Michigan

umich.edu/~lowbrows/reflections/2006/dsnyder.19.html

Gravity, Part 4: Globular Clusters & Galaxies: The dynamics of globular ... like this : all stars in the cluster move in Kepler orbits around the center of mass. ... Some sections of the galaxy have lots of stars (lots of mass per volume or high density); ... to believe physical collisions between stars were extremely rare and there ...

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Test 4 Review Clicker Questions

physics.unm.edu

b) 30,000 light-years from the center in a globular cluster. ... High-speed motion of gas and stars near the Milky Way Galaxy's center is explained by ..... Due to the density and collisions among galaxies, ______ are rare in the centers of ...

Galaxies and QSOs - SDSS SkyServer DR12

skyserver.sdss.org

Stars, gas, and interstellar dust orbit the center of the galaxy due to the gravitational ... regions called giant molecular clouds, and the stars sometimes form into star clusters. ... When galaxies collide they interpenetrate - the stars slip through - but gas ... are likely to have formed first in high-density regions like galaxy cl...

Hubble Finds Nearest Quasar Powered by a Double Black Hole

www.nasa.gov

Aug 27, 2015 ... In the center of the image is the immense galaxy cluster Abell S1063, located 4 .... On May 4, astronomers took advantage of a rare simultaneous transit, when ... somehow — often this happens due to a collision with another galaxy. ..... Hubble observations of gas density compared to computer simulations.