Galaxies, part 1 Crash course in astronomy #38

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The Milky Way is our neighborhood in the universe. It's a galaxy and there are many more. Galaxies contain gas, dust, and billions or more stars. They come in four main shapes: elliptical, spiral, peculiar and irregular. Galaxies can collide and grow by eating each other.

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Chapters:
Introduction: Galaxies 00:00
Spiral galaxies 3:00 p.m.
Elliptical galaxies 5:22
Galactic Collisions 6:18
Special galaxies 8:46
Irregular Galaxies 9:29
Review 11:08
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PHOTOS/VIDEOS
NGC 5363 http://aftar.uaa.alaska.edu/gallery/details.cfm?img316&type# [credit: TA Rector (University of Alaska Anchorage) and H. Schweiker (WIYN and NOAO/AURA/NSF)]
Panorama of the spiral galaxy, M31 http://www.noao.edu/image_gallery/html/im1259.html [credit: Local Group Survey Team and Provost TA (University of Alaska Anchorage)]
Animation of a variable star http://www.spacetelescope.org/videos/heic1323j/ [credit: NASA, ESA, M. Kornmesser]
Hubble M31 PHAT Mosaic http://hubblesite.org/newscenter/archive/releases/2015/02/image/a/ [credit: NASA, ESA, J. Dalcanton, BF Williams and LC Johnson (University of Washington), the Team PHAT and R. Gendler]
Elliptical – The death of giant galaxies spreads from the core https://www.spacetelescope.org/news/heic1508/ [credit: ESA/Hubble & NASA]
Spiral – HUBBLE VIEW OF THE BARRED SPIRAL GALAXY MESSIER 83 http://sci.esa.int/hubble/53590-hubble-view-of-barred-spiral-galaxy-messier-83/ [credit: NASA, ESA and Hubble Heritage team (STScI/AURA). Credit: William Blair (Johns Hopkins University)]
Individual – Galaxy collisions make love, not war https://www.spacetelescope.org/news/heic0615/ [credit: NASA, ESA and Hubble Heritage Team STScI/AURA)-ESA/Hubble Collaboration]
Irregular – Small galaxy explored http://www.nasa.gov/mission_pages/spitzer/multimedia/asmccaption_prt.htm [credit: NASA/JPL-Caltech/STScI]
Hubble image of Messier 101 http://hubblesite.org/newscenter/archive/releases/2009/07/image/h/ [credit: NASA, ESA, K. Kuntz (JHU), F. Bresolin (University of Hawaii) , J. Trauger (Jet Propulsion Lab), J. Mold (NOAO), Y.-H. Chu (University of Illinois, Urbana) and STScI]
A poster-sized image of the magnificent barred spiral galaxy NGC 1300 http://www.spacetelescope.org/images/opo0501a/ [credit: NASA, ESA and The Hubble Heritage Team STScI/AURA)]
NGC 3344 http://skycenter.arizona.edu/gallery/Galaxies/NGC3344 [credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona]
Flake spiral NGC 2841 http://www.spacetelescope.org/news/heic1104/ [credit: NASA, ESA and Hubble Heritage Team]
Barred spiral galaxy NGC1365 https://www.noao.edu/image_gallery/html/im1034.html [credit: SSRO/PROMPT and NOAO/AURA/NSF]
Magnificent details in a dusty spiral galaxy http://hubblesite.org/newscenter/archive/releases/1999/25/image/a/ [credit: Hubble Heritage team]
Panoramic view of Messier 77 http://www.spacetelescope.org/videos/heic1305b/ [credit: NASA, ESA, Digitized Sky Survey 2. Thanks: A. van der Hoeven]
Hubble mosaic of the Sombrero Galaxy http://www.spacetelescope.org/images/opo0328a/ [credit: NASA/ESA and The Hubble Heritage Team]
Spiral galaxy NGC 4565 http://www.eso.org/public/images/eso0525a/ [credit: ESO]
M87 (with Jet) http://skycenter.arizona.edu/gallery/Galaxies/M87%28withJet%29 [credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona]
M59, NGC4621 https://www.noao.edu/image_gallery/html/im0579.html [credit: NOAO/AURA/NSF]
Fulldome simulation of colliding galaxies http://www.spacetelescope.org/videos/gal_coll_dome_3800/ [credit: NASA/STScI]
Galaxie Antennas http://www.spacetelescope.org/images/potw1345a/ [credit: ESA/Hubble & NASA]
Artist concept Terzan 5 http://www.sdss3.org/press/images/20111130.fourtails.streams-3.jpg [credit: Amanda Smith, Institute of Astronomy, University of Cambridge]
Pair of interacting galaxies Arp 87 http://hubblesite.org/newscenter/archive/releases/2007/36/image/a/ [credit: NASA, ESA and Hubble Heritage Team]
Cartwheeling to celebrate the end of an era http://www.spacetelescope.org/images/potw1036a/ [credit: ESA/Hubble & NASA]
Hoag's object http://hubblesite.org/newscenter/archive/releases/2002/21/image/a/ [credit: NASA and The Hubble Heritage Team]
Paranal Nights https://www.eso.org/public/images/potw1401a/ [credit: Y. Beletsky (LCO)/ESO]
Tarantula Nebula http://www.eso.org/public/images/eso1023a/ [credit: TRAPPIST/E. Jehin/ESO]
Hubble Ultra Deep Field 2014 http://hubblesite.org/newscenter/archive/releases/2014/27/image/a/ [credit: NASA, ESA]