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24 juillet 2023 - 14:12
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Galaxies, part 1: Crash Course Astronomy #38
The Milky Way is our neighborhood in the universe. It’s a galaxy and there are many others out there. Galaxies contain gas, dust, and billions of stars or more. They come in four main shapes: elliptical, spiral, peculiar, and irregular. Galaxies can collide, and grow in size by eating each other.
Check out the Crash Course Astronomy poster here: http://store.dftba.com/products/crashcourse-astronomy-poster
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Chapters:
Introduction: Galaxies 00:00
Spiral Galaxies 3:00
Elliptical Galaxies 5:22
Galactic Collisions 6:18
Peculiar Galaxies 8:46
Irregular Galaxies 9:29
Review 11:08
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PBS Digital Studios: http://youtube.com/pbsdigitalstudios
Follow Phil on Twitter: https://twitter.com/badastronomer
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Support CrashCourse on Patreon: http://www.patreon.com/crashcourse
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PHOTOS/VIDEOS
NGC 5363 http://aftar.uaa.alaska.edu/gallery/details.cfm?img=316&type=# [credit: T.A. Rector (University of Alaska Anchorage) and H. Schweiker (WIYN and NOAO/AURA/NSF)]
Panorama of Spiral Galaxy, M31 http://www.noao.edu/image_gallery/html/im1259.html [credit: Local Group Survey Team and T.A. Rector (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, B.F. Williams, and L.C. Johnson (University of Washington), the PHAT team, and R. Gendler]
Elliptical - Death of giant galaxies spreads from the core https://www.spacetelescope.org/news/heic1508/ [credit: ESA/Hubble & NASA]
Spiral - HUBBLE VIEW OF BARRED SPIRAL GALAXY MESSIER 83 http://sci.esa.int/hubble/53590-hubble-view-of-barred-spiral-galaxy-messier-83/ [credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA). Credit: William Blair (Johns Hopkins University)]
Peculiar - Colliding galaxies make love, not war https://www.spacetelescope.org/news/heic0615/ [credit: NASA, ESA, and the Hubble Heritage Team STScI/AURA)-ESA/Hubble Collaboration]
Irregular - Little 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. Mould (NOAO), Y.-H. Chu (University of Illinois, Urbana), and STScI]
A poster-size image of the beautiful 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]
Flocculent spiral NGC 2841 http://www.spacetelescope.org/news/heic1104/ [credit: NASA, ESA and the 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: The Hubble Heritage Team]
Panning across Messier 77 http://www.spacetelescope.org/videos/heic1305b/ [credit: NASA, ESA, Digitized Sky Survey 2. Acknowledgement: 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]
Antennae Galaxies http://www.spacetelescope.org/images/potw1345a/ [credit: ESA/Hubble & NASA]
Terzan 5 Artist’s Concept http://www.sdss3.org/press/images/20111130.fourtails.streams-3.jpg [credit: Amanda Smith, Institute of Astronomy, University of Cambridge]
Interacting Galaxy Pair Arp 87 http://hubblesite.org/newscenter/archive/releases/2007/36/image/a/ [credit: NASA, ESA, and the Hubble Heritage Team]
Doing cartwheels 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]
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