Stellar explosion you can see with your own eyes
All you need is a small backyard telescope or a pair of binoculars, dark clear skies away from a city, and you can see this new nova. But it won't be visible for long! Japanese amateur astronomer, Yuji Nakamura discovered V1405 Cas on March 18. Its coordinates are; right ascension 23 24 47.73, declination +61 11 14.8. Happy viewing! Learn more:
WHITE DWARFS https://www.spacetv.net/white-dwarfs/
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What are White Dwarfs? - Ask a Spaceman!
Full podcast episodes: http://www.askaspaceman.com
Follow: http://www.twitter.com/PaulMattSutter and http://www.facebook.com/PaulMattSutter It’s time for school! The Astro101 series will cover some of the most important questions in astronomy. In today’s lesson, we’ll have: What is a white dwarf? What is a neutron star? What is a black hole? I discuss these questions and more in today’s Ask a Spaceman! Follow all the show updates at http://www.askaspaceman.com, and help support the show at http://www.patreon.com/pmsutter Keep those questions about space, science, astronomy, astrophysics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE! Music by Jason Grady and Nick Bain.
These White Dwarfs Orbit Around One Another in 8 Minutes
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What Are White Dwarf Stars?
White dwarfs are basically the burned-out cores of stars. When a red giant expels most of its outer material it becomes a planetary nebula and what remains is the core of the star which becomes a very hot white dwarf with a temperature over 100,000 Kelvin. SUBSCRIBE ► https://goo.gl/PLLFPz
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White Dwarf Stars And Black Dwarf Stars: The Last Stage Before Darkness!
White Dwarf Stars And Black Dwarf Stars
From what they are, to whether our sun will become like them one day, join me as I show you white and black dwarf stars! Subscribe for more videos:https://www.youtube.com/c/InsaneCuriosity?sub_confirmation=1? There are MANY stars in the universe, that's part of the reason why the universe is so special. There are stars of massive sizes, there are ones that are massive and yet don't shine brightly, or ones that are so small that they can't be seen outside of a certain distance. This variety makes our universe even more special as a whole. But when it comes to some of the most unique stars of the set, that would be the White and Black Dwarf Stars.
So let's ask the basic question, "What are White and Black Dwarf Stars?" I'll start with the White Dwarfs first because those we know are in the universe right now.
White Dwarfs are also known "degenerate dwarfs", and that's because they are a stellar core remnant that is made up of highly dense matter of an electron-degenerate variety. In short, the star is one that is very small, and yet very dense in terms of its makeup. A great way of thinking about it is that a White Dwarf can have the size of our planet, but its mass is more equivalent to that of our own sun. And if you didn't know, you could fit 1.3 MILLION of our Earths into the sun. So imagine having that much mass in something the size of the Earth. That's one of the major reasons why White Dwarfs are so special.
Here's the rub though, despite having all of that mass and energy, a White Dwarf honestly doesn't shine that brightly. This is because unlike most other stars in the universe, it doesn't have any nuclear fusion going on within itself (our own sun does this for the record). Instead, the light it produces is Thermal Energy built up from the stores of it from within the core.
What might surprise you though is that while there are only said to be about 8 White Dwarf stars within the hundred star systems nearest our own sun...many believe that the White Dwarf is the "final fate" of many dying stars. Specifically, "White dwarfs are thought to be the final evolutionary state of stars whose mass is not high enough to become a neutron star."
If you're curious, that definition would apply to about 97% of the stars in the Milky Way Galaxy! Which means that having that many White Dwarf stars would cause some serious problems down the road, but that's something we'll get into a bit later. It should be noted though that one of the 8 White Dwarf stars we know about is only 8.6 light years away at SIrius B. Which is one of the main reasons we even known about it at all.
So how does something like our own sun go from being like that to a White Dwarf? Well it's not an instant thing if that's what you're wondering. It's very much a thing of "phases."
"After the hydrogen-fusing period of a main-sequence star of low or medium mass ends, such a star will expand to a red giant during which it fuses helium to carbon and oxygen in its core by the triple-alpha process. If a red giant has insufficient mass to generate the core temperatures required to fuse carbon (around 1 billion K), an inert mass of carbon and oxygen will build up at its center. After such a star sheds its outer layers and forms a planetary nebula, it will leave behind a core, which is the remnant white dwarf.
So as you can see, this is something that takes billions of years to complete, and considering our sun (which is a Yellow Dwarf star if you recall) has likely a couple billion years before it goes into the Red Giant phase of its life (which will eradicate the Earth, Mars and many other things until it gets WAY closer to Jupiter), we'll be fine, and thus we won't get to see a White Dwarf in our lifetime. That's not to say that other star systems won't get to see it happening sooner, and it's possible if we find the right star that we could watch a White Dwarf being born...theoretically of course.
Speaking of theoretically...let's dive into the other side of the spectrum...the Black Dwarf stars because this may not be exactly what you're thinking it is.
Before we dive into that Black Star topic and such, be sure to like our video and subscribe to the channel! That way you don't miss ANY of our weekly videos!
Ok, so what exactly is a Black Dwarf Star? To answer that, we actually have to go back to the White Dwarf star, don't worry though...it won't be that long though. You see, because of the fact that White Stars don't do nuclear fusion to maintain its heat and shine, and thus relies on stored Thermal Energy, that means that eventually...they're going to run out of power.
In this case, they gradually cool over time. Granted, because of the density of White Dwarfs that's a long, LONG, time, but when they do, their surfaces will start to crystalize until eventually...they're a Black Dwarf star...theoretically.
What Are White Dwarf Stars?
White dwarfs are a type of stellar corpse, the mass left over when fusion stops in a star. They would collapse on themselves under gravity if it wasn't for quantum mechanics, the Pauli exclusion principle, and electron degeneracy pressure. Here's how they work.
VIDEO ANNOTATIONS/CARDS What are Black Holes?
http://youtu.be/ACCeFVeT984 Nuclear Fusion Explained:
https://youtu.be/LKUPAk5049M Crookes Radiometer:
https://youtu.be/Li_nmKw4Buc Periodic Table Explained:
RELATED YOUTUBE VIDEOS Kurz Gesagt on White Dwarfs:
https://youtu.be/qsN1LglrX9s Crash Course on White Dwarfs:
https://youtu.be/Mj06h8BeeOA Socratica on White Dwarfs:
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https://youtu.be/LeUcjqqhNxM Sirius A and B:
http://chandra.harvard.edu/resources/illustrations/chandraPortraits.html Seven Dwarfs:
The Last Light Before Eternal Darkness – White Dwarfs & Black Dwarfs
Everything will end. Even the universe. But in a future so far away that it defies description, there will still be light and therefore a chance for life. It will be around White Dwarfs, the corpses of stars. But even they will fade one day.. Check out Epic Mountain Music: http://www.epic-mountain.com/ OUR CHANNELS
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What are white dwarfs? (Astronomy)
White dwarfs are dead stars that continue to glow because of heat, not nuclear fusion. Most stars in our universe will end up as a white dwarf star. Join us to learn how white dwarfs are made, what they’re like, how long they’ll shine, and how astronomers detect them. Be sure to subscribe so you don't miss videos from Socratica!
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White Dwarfs & Planetary Nebulae: Crash Course Astronomy #30
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?
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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)]