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)]


Jack Major says:

I believe the Aliens that frequent our Planet use Dark Matter to travel in our Atmosphere ..and fuel their Craft…. I believe they may get the Dark Matter from Volcanoes and the Ocean Floor.. Tapping it through the crust of the ocean floor…. at Hot Spots located at the Bottom of Our Oceans..and Lakes… that may be near Lava or Active Volcanoes or just hot Molten Earth…. Also they May get Dark Matter From the Surface of the Sun..Concentrated in the Orange Plasma of the Sun…. Just a Thought??

Mostly_ Liberal says:

wow this video answered so many questions i always had abt dark matter. i feel most shows talk so much abt dark energy that they focus less on dark matter.

Mauro van landschoot says:

0:51 pauze it

thetravelinghermit says:

8:32 Apparently Kerbals go to Crash Course when they die

Pablo Nicolás Andreu Ventura says:

i like your videos alot you are the best

John Terpack says:

Am I the only one who watches these videos about dark matter and thinks, with a giggle… aether?

sajid akram says:

so demons, hell, ect must exist since most of creation is unseen. so enjoy hell you bible paedo scum

S.&M. H-M says:

Thanks for the Mini docu.! Recently I endured the,"Flat earth Society's", videos with an open mind with my husband,! However I do have an affinity for sci-fi!

Katy Blankenship says:

I am very skeptical about the existence of dark matter, the argument has many valid points, but I fear it is too similar to the convenient "ether." We need to continue to challenge these theories in order to progress with stronger evidence and information.

David P says:

May be dark matter are the dead souls lol!

_MLG_SeAlZ Gamez_ says:

is it weird that im 10 and im in 8th grade pls dont judge ;_;

David Renfro says:

The more and more scientist describe dark matter it sounds like God.

Razor Khan says:

dear +CrashCourse,

I have a question. Dark matter particles don't interact with ordinary matter, but they contribute gravity. That means dark matter must interact with ordinary stuffs in terms of gravity if I am not wrong. According to the dark matter theory, the particles of the dark matter are always passing through you and me (earth), and therefore, it must also be passing through the big stars in the sky.

Now, imagine we have a huge star (or a black or a neutron star) that has an immense gravity at it's center. When dark matter particles are crossing through the star, wouldn't they fall into the star core as it has tremendous gravity???


Malcom_1466 says:

Who is this?

AnotherAccount says:

We have these forms because of distant stars and invisible, undetectable matter

Sam Simpson says:

Yet inquiry purple expose there holiday late first European.

Whizzz Energy says:

What about a galaxy with black holes instead of stars. You wouldn't be able to see that

Barbed Two says:

You guys should do a series on astrophysics

satansaysimnuts says:

I like your graph of how space has gravity wells toward objects of mass.
But your missing objects that would repel space away from it.
Anti-Space objects.
These too would cause a gravitational lens but with a black center or be almost completely invisible even if they are huge.
Though probably extremely tiny.
And could be in part responsible for the expansion of the universe.

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