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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...

Test 4 Review Clicker Questions

physics.unm.edu/Courses/Saul/Common/Astr101_Exams/Exam-4/Test4_ReviewClickerQuestions.ppt

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 - SkyServer - SDSS

skyserver.sdss.org/dr1/en/astro/galaxies/galaxies.asp

Stars, gas, and interstellar dust orbit the center of the galaxy due to the gravitational ... The Milky Way has more than a hundred billion stars, but the stars are so far apart that they almost never collide. ... ago, because galaxies are likely to have formed first in high-density regions like galaxy clusters. ... Irr II galaxies are...

Galaxies, Properties in Relation to Environment - NED

ned.ipac.caltech.edu/level5/ESSAYS/Dressler/dressler.html

Galaxies cluster; although a small fraction live in splendid isolation, the ... million light-years); therefore, encounters between galaxies are relatively rare. ... (as would be common in a rich cluster) because a low-speed collision would ... Furthermore, the fact that the stellar density at the center of an elliptical galaxy is typi...

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 ... NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the ... For more Chandra images, multimedia and related materials, visit: ...... This change in density is most likely caused by a collision between this cluster ...

"Russian Doll" Galaxy Clusters Reveal Information About Dark ...

www.nasa.gov/mission_pages/chandra/russian-doll-galaxy-clusters-reveal-information-about-dark-energy.html

Apr 28, 2016 ... “In this sense, galaxy clusters are like Russian dolls, with smaller ones having a similar ... For more Chandra images, multimedia and related materials, visit: .... greater density and show a strong concentration toward the galaxy's center. .... To learn more about clusters, including how they grow via collisions, ...

A Test of the Collisional Dark Matter Hypothesis from Cluster Lensing

arxiv.org/pdf/astro-ph/0002050v1.pdf

some dwarf galaxies has large, constant-density cores, as opposed to the predicted ... absence of collisions in the lensing cores of massive clusters implies that any dark ... the dark matter particles should be rare to prevent the dark matter from .... two images relative to the center would be zero for a spherical potential.

Milky Way's Black Hole Shows Signs of Increased Chatter | NASA

www.nasa.gov/mission_pages/chandra/milky-way-s-black-hole-shows-signs-of-increased-chatter.html

Sep 23, 2015 ... For example, the increased X-ray activity could be due to a change in the ... NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the ..... or black hole-neutron star collisions eventually forming either a black hole or ...... Galaxy clusters like 3C295 also contain large amounts of dark matter, ...

Colliding galaxy clusters offer strongest case yet for dark matter | Ars ...

arstechnica.com/science/2015/03/colliding-galaxy-clusters-offer-stongest-case-yet-for-dark-matter/

Mar 26, 2015 ... An image of the galaxy cluster MACS J0416.1–2403 with dark ... dark matter, collisions between clusters of galaxies provide a great testing ground. ... matter density toward the centers of galaxies and galaxy clusters, and ... If the interactions are rare but exchange a lot of momentum... dark ... Related Stories ....

The Natures of the Stars - Jim Kaler

stars.astro.illinois.edu/sow/star_intro.html

Galaxies, The Galaxy, Galaxy clusters, Giant stars and helium fusion, Globular ... the fusion of hydrogen into helium under conditions of enormous temperature and density. ... The temperature at the center of the Sun is 15.6 million degrees Kelvin (K .... and helium (about 10%), elements that are relatively rare on our planet.

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Galaxies - Astronomy Notes

www.astronomynotes.com

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.

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

umich.edu

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 ...

Frontier Fields Galaxy Cluster MACS J0717 | NASA

www.nasa.gov

Mar 10, 2016 ... Galaxy cluster MACS J0717, one of the most complex and distorted .... NASA's Marshall Space Flight Center in Huntsville, Alabama, .... often this happens due to a collision with another galaxy. ..... This rare galaxy cluster, which is located 10 billion light years from Earth, weighs almost 500 trillion Suns.