White Dwarfs & Planetary Nebulae: Crash Course Astronomy #30
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Today Phil follows up last week’s look at the death of low mass stars with what comes next: a white dwarf. White dwarfs are incredibly hot and dense objects roughly the size of Earth. They also can form planetary nebulae: huge, intricately detailed objects created when the wind blown from the dying stars is lit up by the central white dwarf. They only last a few millennia. The Sun probably won’t form one, but higher mass stars do. -- Table of Contents When low mass stars die they form white dwarfs 0:54 White dwarfs are roughly the size of Earth 2:16 Cloudy with a chance of Planetary Nebulae 3:59 Life Span 9:06 -- PBS Digital Studios: http://youtube.com/pbsdigitalstudios Follow Phil on Twitter: https://twitter.com/badastronomer Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Patreon: http://www.patreon.com/crashcourse -- PHOTOS/VIDEOS Journey to the centre of the Sun http://www.spacetelescope.org/videos/astro_ac/ [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)] Blowing Bubbles http://chandra.harvard.edu/resources/animations/pne.html [credit: (NASA/CXC/April Jubett)] Artist's impression of the sizes of Sirius B and the Earth http://www.spacetelescope.org/images/heic0516c/ [credit: ESA and NASA] The Dog Star, Sirius A, and its tiny companion http://www.spacetelescope.org/images/heic0516a/ [credit: NASA, ESA, H. Bond (STScI), and M. Barstow (University of Leicester)] The Spirograph Nebula https://www.spacetelescope.org/images/opo0028a/ [credit: NASA/ESA and The Hubble Heritage Team STScI/AURA] M27, NGC6853, Dumbbell Nebula https://www.noao.edu/image_gallery/html/im0688.html [credit: REU program/NOAO/AURA/NSF] Soap Bubble Nebula, PN G75.5+1.7 https://www.noao.edu/image_gallery/html/im1059.html [credit: T. A. Rector/University of Alaska Anchorage, H. Schweiker/WIYN and NOAO/AURA/NSF] Hubble Sees Supersonic Exhaust From Nebula http://www.spacetelescope.org/images/opo9738a/ [credit: Bruce Balick (University of Washington), Vincent Icke (Leiden University, The Netherlands), Garrelt Mellema (Stockholm University), and NASA/ESA] Hubble snaps NGC 5189 http://www.spacetelescope.org/images/heic1220a/ [credit: NASA, ESA and the Hubble Heritage Team (STScI/AURA)] A dying star’s toxic legacy http://www.spacetelescope.org/images/potw1110a/ [credit: ESA/Hubble & NASA] Eskimo Nebula http://www.nasa.gov/multimedia/imagegallery/image_feature_762.html [credit: NASA/Andrew Fruchter (STScI)] Planetary nebula Abell 39 http://www.noao.edu/image_gallery/html/im0636.html [credit: WIYN/NOAO/NSF] The Butterfly Hunter http://chandra.harvard.edu/resources/animations/pne.html [credit: (NASA/CXC/April Jubett)] Red Giant Sun (video) http://www.spacetelescope.org/videos/hst15_red_giant_sun/ [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)] The planetary nebula Abell 33 captured using ESO's Very Large Telescope https://commons.wikimedia.org/wiki/File:The_planetary_nebula_Abell_33_captured_using_ESO%27s_Very_Large_Telescope.jpg [credit: ESO, Wikimedia Commons] ESO's VLT images the planetary nebula IC 1295 http://www.eso.org/public/usa/images/eso1317a/ [credit: ESO] Looking Down a Barrel of Gas at a Doomed Star http://hubblesite.org/newscenter/archive/releases/1999/01/image/a/ [credit: The Hubble Heritage Team (AURA/STScI/NASA)]
Comments
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the evolution of a star a few steps will be missing cloud-prtostar-main sequence star-gets bigger-red giant-supernova and hydrogen core left- white dwarf pulsar/neutorn star or black hole-vaporises dee end.
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Please don't call them "white dwarfs" - they are "white little stars". This is a a microaggression.
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Fried planets still orbit? Weird ...
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Does Nuclei means Nucleus ?
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this is an amazing episode of crash course
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Noticed you said centrifugal force. isnt that a ficticous force?
Thanks, Elliot -
Could it be that the star's magnetic field can cause some disturbances when it expands, affecting the shape of the planetary? Actually, does it still even have the field at that point?
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Was the "Delicate Tendrils" comment a reference to Les Claypool?
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After watching and getting to the 30th episode, I wonder how much does Phil students groan and/or want to jump out of the window after he makes another pun in class. If not for his enthusiasm and how skillfull he is at teaching...
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I just realized the sentence at the beginning of the intro was "One giant leap for mankind,"
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Your professor was a genius in that case. Either that, or he could predict the future, but the former is more appropriate.
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Thank you very much for making this video, Phil Plait and the others at CrashCourse Astronomy! I really enjoyed hearing about white dwarfs, planetary nebulæ and how they form. So beautiful! I hope you will mention black dwarfs sometime. ;D
10:14 Love that laughter! Love it! -
Just a question. A white dwarf is super compressed matter. Under such compression shouldn't the temperature remain hot forever? If a white dwarf has completely cooled down, will it be cold down to it's centre?
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His face at 8:13 lol
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i wish that had a Turkish subtitle...
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can you clarify this definition?
a brown dwarf that comes from a near fail star due to its small mass and it can burn fuels for trillions years.
a brown dwarf that comes from a white dwarf after a supernova due to its large mass and it can burn fuels for trillions years.
does a brown dwarf that comes from a white dwarf exist in our universe? because the age of universe is not old enough to have one. -
White dwarf, that's where your mom was born
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CENTRIFUGAL FORCE DOES NOT EXIST!
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Could Jupiter accrete mass from the nebula and become a star?
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can anyone explain the differnce between neutron stars and white dwarfs?
ur help is appreciated :D
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