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Galaxies, part 1: Crash Course Astronomy #38

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    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.

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


    Table of Contents
    Milky Way is a Galaxy (One of Many) 2:04
    Galaxies Have Four Main Shapes 3:18
    Galaxies Can Collide 6:05


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    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.

    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.

    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).

    Acknowledgement: 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(withJet) [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.

    Hubble Ultra Deep Field 2014 http://hubblesite.org/newscenter/archive/releases/2014/27/image/a/ [credit: NASA, ESA]

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