Dark Matter: Crash Course Astronomy #41

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Today on Crash Course Astronomy, Phil dives into some very dark matters. The stuff we can actually observe in the universe isn’t all there is. Galaxies and other large structures in the universe are created and shifted by a force we detect mostly indirectly, by observing its impact: DARK MATTER.

Crash Course Astronomy Poster: http://store.dftba.com/products/crashcourse-astronomy-poster

Table of Contents
Normal and Dark Matter 0:55
Dark Matter Only Interacts With Normal Matter Through Gravity 4:27
Dark Matter Bends Light 5:08

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Virtual tour in our Solar System (Artist’s impression) http://www.spacetelescope.org/videos/hubblecast27b/ [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)]
Hubblecast 11: A grand design in a galactic festoon http://www.spacetelescope.org/videos/heic0719a/ [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)]
Hubble’s High-Definition Panoramic View of the Andromeda Galaxy http://hubblesite.org/newscenter/archive/releases/2015/02/image/a/ [credit: NASA, ESA, J. Dalcanton, B.F. Williams, and L.C. Johnson (University of Washington), the PHAT team, and R. Gendler]
Panning and zooming on Abell 1689 http://www.spacetelescope.org/videos/heic0805b/ [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)]
All-sky image of molecular gas and three molecular cloud complexes seen by Planck http://www.nasa.gov/mission_pages/planck/multimedia/pia15227.html#.ViZwA36rSUl [credit: ESA/Planck Collaboration]
How to Become a Star http://www.eso.org/public/images/eso0102a/ [credit: ESO]
Neutron star illustrated https://commons.wikimedia.org/wiki/File:Neutron_star_illustrated.jpg [credit: NASA, Casey Reed – Penn State University]
Alone in Space – Astronomers Find New Kind of Planet http://www.nasa.gov/topics/universe/features/pia14093.html [credit: NASA/JPL-Caltech]
Black hole deforms space http://www.spacetelescope.org/videos/hst15_blackhole_grid/ [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)]
Gravitational lensing in action http://www.spacetelescope.org/videos/heic1106a/ [credit: NASA, ESA & L. Calçada]
Bullet Cluster http://apod.nasa.gov/apod/image/0608/bulletcluster_comp_f2048.jpg [credit: X-ray: NASA/CXC/CfA/ M.Markevitch et al.; Lensing Map: NASA/STScI; ESO WFI; Magellan/U.Arizona/ D.Clowe et al. Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.]
Bullet Cluster, Optical http://chandra.harvard.edu/photo/2008/bullet/bullet_optical.jpg [credit: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.]
Bullet Cluster, X-ray http://chandra.harvard.edu/photo/2008/bullet/bullet_xray.jpg [credit: NASA/CXC/CfA/ M.Markevitch et al.]
The Bullet Cluster http://www.esa.int/spaceinimages/Images/2007/07/The_Bullet_Cluster2 [credit: X-ray: NASA/CXC/CfA/M.Markevitch, Optical and lensing map: NASA/STScI, Magellan/U.Arizona/D.Clowe, Lensing map: ESO WFI]
Pandora’s Cluster — Clash of the Titans http://www.nasa.gov/mission_pages/hubble/science/pandora-cluster.html [credit: NASA]
Hubble Refines Distance to Pleiades Star Cluster http://hubblesite.org/newscenter/archive/releases/2004/20/image/a/ [credit: NASA, ESA and AURA/Caltech]
Stephan’s Quintet http://apod.nasa.gov/apod/ap120225.html [credit: Hubble Legacy Archive, ESA, NASA]
Virgo Cluster Galaxies http://apod.nasa.gov/apod/ap150804.html [credit: Rogelio Bernal Andreo]
Illustration of the distribution dark matter in the Universe http://www.nasa.gov/mission_pages/hubble/science/hst_img_20080520.html [credit: NASA, ESA, and E. Hallman (University of Colorado, Boulder)]


terry beaton says:

Is there any explanation put forward as to why Dark Matter doesn't exist withing our solar system, or at least in a an amount great enough to effect the orbits of the planets?

gomagoma313 says:

Im excited when i think this weirdest thing would someday be a familiar thing by dint of science.

Rob Babcock says:

Great video! This is one of the best series on all of youtube.

MrCakepuff says:

Question: What are neutrinos' purpose? All I know is that they rarely hit atoms, just float through things, can be produced by supernovas, and (I think) are a type of radiation.

Heinskitz says:

So glad to see another episode! You had me worried there – it went quiet there for a while. I filled the void with Neil deGrasse Tyson's seminars though, and … oh wait. Awesome vid on dark matter btw

Jordan Benjamin says:

Fritz Zwiky…lol

brucebillb says:

The studying of clusters colliding is mind blowing. Yeah we have come a long way to study the cosmos but I never realized at this scope and scale! Einstein truly did provide us the tools to understand the universe by leaps and bounds.

ChingooOK says:

why aren't there axion black holes?

TheJetPug says:

Learnt more in 3 episodes of Crash Course Astronomy than I have in 4 years of English Physics education.

10/10 would public school again

BachikoiBabi says:

We are living beings of normal matter, perhaps with as much dark matter filling the universe there are living beings of dark matter. Aliens we can't even detect.

AnyOtherNamePlease says:

I went into withdrawal waiting for this episode… I had to rewatch the whole series just to get my fix!

WiseWik says:

Phil is like ISIS of astronomy: blowing up minds every week (sorry, couldn't help myself).

Owen Hunt says:

What if other dimensions or branes interact via gravity and we are observing the effects of all of the universes that contain mass. It could explain how there is so much of it, why none of the fundamental forces seem to affect it, and why it seems to interact with itself so weakly.
I love all of Crash Course, and this course is possibly my favorite. Keep it up!

randallross420 says:

nice obi wan reference :)

Kabisan Thanendran says:

Is it possible to get a crash course algebra?

VitruvianSasquatch says:

No looking at stuff like MOND, huh? :P

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