White Dwarfs & Planetary Nebulae: Crash Course Astronomy #30
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Date: 2022-04-04
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Comments and reviews: 10
Dragrath1
Its is worth noting that in Nature early December 2019 we got our first confirmation that giant planets in this particular case an ice giant similar to Neptune can survive the red giant and planetary nebula stages at least enough for their outer atmospheric envelopes to be blasted away by the hot and bright ionizing radiation of their stars. Based on the mix of gasses the radiation will fade out long before the Ice giant would entirely evaporate away so it seems likely that at least some giant planets or at least the dense and massive inner layers will slowly cool off with their dead stars. Perhaps the sun will not be so alone after all with the remnants of Jupiter Saturn Uranus and Neptune possibly coming along for the ride if they don't wander off as free floating worlds.
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Its is worth noting that in Nature early December 2019 we got our first confirmation that giant planets in this particular case an ice giant similar to Neptune can survive the red giant and planetary nebula stages at least enough for their outer atmospheric envelopes to be blasted away by the hot and bright ionizing radiation of their stars. Based on the mix of gasses the radiation will fade out long before the Ice giant would entirely evaporate away so it seems likely that at least some giant planets or at least the dense and massive inner layers will slowly cool off with their dead stars. Perhaps the sun will not be so alone after all with the remnants of Jupiter Saturn Uranus and Neptune possibly coming along for the ride if they don't wander off as free floating worlds.
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jacob
A few years ago, I took an intro astronomy class taught by a respected astrophysicist in the community. She was incredibly smart, but I didn-t really learn much, and the class definitely wasn-t enjoyable. If I had been taught by Phil, it would-ve been my favorite class during my undergrad thus far. He-s so passionate and fascinated by this stuff, and rightly so, because it-s absolutely INSANE. Love this series. 10/10. It makes me want to take more astronomy courses.
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A few years ago, I took an intro astronomy class taught by a respected astrophysicist in the community. She was incredibly smart, but I didn-t really learn much, and the class definitely wasn-t enjoyable. If I had been taught by Phil, it would-ve been my favorite class during my undergrad thus far. He-s so passionate and fascinated by this stuff, and rightly so, because it-s absolutely INSANE. Love this series. 10/10. It makes me want to take more astronomy courses.
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11 min video about white dwarf and you forgot to mention how they are created. they are created because while the fusion is up and running in the star core, the energy createt by that prevent from the star collapsing due to its own gravity. when the fusion stops at the star core, the stars enormous gravity crashes its core to this white dwarf.
seriously we came here to learn staff, not to see how much things you know
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11 min video about white dwarf and you forgot to mention how they are created. they are created because while the fusion is up and running in the star core, the energy createt by that prevent from the star collapsing due to its own gravity. when the fusion stops at the star core, the stars enormous gravity crashes its core to this white dwarf.
seriously we came here to learn staff, not to see how much things you know
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Dreammirror
I always thought if any planet that gets engulfed by an expanding red giant, it would be instantly destroyed by a combination of gravity & heat. Never thought it could survive inside the star for a bit(though likely in a molten state.
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I always thought if any planet that gets engulfed by an expanding red giant, it would be instantly destroyed by a combination of gravity & heat. Never thought it could survive inside the star for a bit(though likely in a molten state.
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Nasser
I saw Phil in a show or film (I can-t remember) and I literally thought, -Oh hey! That-s the Crash Course guy! -
Btw, this is one of my favourite crash course, the only one that comes close is the world history one.
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I saw Phil in a show or film (I can-t remember) and I literally thought, -Oh hey! That-s the Crash Course guy! -
Btw, this is one of my favourite crash course, the only one that comes close is the world history one.
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jmerdur
I don't understand how white dwarfs are still that hot after becoming a white dwarfs. You said fusion is what powers a star. and fusion stops after becoming a white dwarfs. So how are they still producing energy?
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I don't understand how white dwarfs are still that hot after becoming a white dwarfs. You said fusion is what powers a star. and fusion stops after becoming a white dwarfs. So how are they still producing energy?
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Neven
UUUhHHH, I learned something today. The idea for planets causing Planetary nebulae deformation is even new for me, and I am in the Astronomical community for 4 years. Although I am working with galaxies, soooo, .
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UUUhHHH, I learned something today. The idea for planets causing Planetary nebulae deformation is even new for me, and I am in the Astronomical community for 4 years. Although I am working with galaxies, soooo, .
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the
7: 20 Interesting how ideas are considered -nutty- by the scientific community until proven true, then they're obvious. Makes you wonder what other -nutty- ideas we hold now that might be obvious in the future.
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7: 20 Interesting how ideas are considered -nutty- by the scientific community until proven true, then they're obvious. Makes you wonder what other -nutty- ideas we hold now that might be obvious in the future.
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May
I have a question though. Since stars stop their fusion with carbon, are the white drawfs made of carbon? If so, with the amount of pressure on them, could they actually create diamonds in the star?
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I have a question though. Since stars stop their fusion with carbon, are the white drawfs made of carbon? If so, with the amount of pressure on them, could they actually create diamonds in the star?
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Shreya
The question that-s been eating my mind LIKE HELL is.
WHY ARE THEY CALLED PLANETARY NEBULAE? What-s the relation? Ughh my mind is on freak out mode, guess no sleep tonight.
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The question that-s been eating my mind LIKE HELL is.
WHY ARE THEY CALLED PLANETARY NEBULAE? What-s the relation? Ughh my mind is on freak out mode, guess no sleep tonight.
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