as a member of the hard of hearing community, i must say that i really appreciate you captioning your videos! i have an audio processing disorder so its really hard for me to understand and process spoken information and speech. you can imagine that makes it really hard for me to learn what i need to at school, and so i supplement with a lot of youtube videos. it's so hard for me to find good material that doesn't just have auto-generated captions. thanks for being inclusive of all your audience :)
ZaWakingEagle except for the part where he says that a black holes center has infinite density because some scientists believe it may be the plank length and not a single point
@@Human-gu2cx I googled what you were talking about. I think for the sake of reaching the audience of interest, defining the concentration of mass at a single point is an ok simplification since the plank length is so small. Taking a pretty large mass and dividing it by that extremely small plank length would cause the density to skyrocket to an insane number. thoughts?
Professor Dave, that’s the best H-R diagram description I’ve ever seen! Most H-R discussions are simply temperature vs mass explanations. You correctly make it a “roadmap” for the life of high/low mass stars. Even textbooks I’ve read don’t make that connection.
@@amlanadarshdas4470 you absolutely can.... You just need to stop yourself and get into the ”flow state" .... Try doing different things in your head and try... Instead of just doing the same thing everyday
This is incredibly helpful for my astronomy class this summer. You managed to take around 4 weeks of information, with all lecture videos coming to a total of about 5 hours, and condensed it into a much more comprehensive video with better visuals that is under 20 minutes. Absolutely amazing and I thank you so much for this.
0:58 Lifetime of Stars 1:39 Nuclear Collision, Nuclear Fusion 2:34 Low Mass Star 4:24 Hydrogen gone, outer layers pushed out, ----> Red Giant for 1 million years 5:00 Helium Flash 5:30 Burning Helium, entering the Horizontal Branch 7:06 High Mass Stars. Big Stars goes out with a Bang! 7:40 Hotter Star, Faster Fusion Quicker Burning 8:25 Layered fusion, to a Core of Iron Nuclei, EXPLOSION 13:20 Collapse Into A Black Hole - Warps Space Time - Consumes Light -The Remnants of Huge Dead Stars 14:47 The Stellar Life Cycle
@@valsarff6525 The pseudo scientific Electric Universe hypothesis has been debunked in so many ways, and so effectively, that it's death has caused a black hole in the brain of its remaining proponents.
They just want a simple explanation of everything. It’s way easier to say “it was all created by a god / the gods”, than actually trying to understand it all.
what a moronic statement. Science is wrong all the time, so how are you defining "denial"? Its just disagreeing till theres evidence that its incorrect, which happens quite often. In this topic, where we know so very little through direct evidence, skepticism is a necessity
I think this is aimed at kids, and despite being an adult with a lifelong interest in science and astronomy and having an above-average level knowledge of both, I find these videos extremely entertaining and chocked full of facts I had forgotten or didn't even know in the first place. This channel definitely deserves better recognition and more subscribers. My friend has just had a baby and this is one of the channels I'll recommend he lets his kid watch while growing up
@@patricksarama4963 Except professor Dave doesn't have people saying he rose from the dead, is the son of god, died for our sins...etc. He's just a man like any of us, communicating peer reviewed, studied, and well understood processes.
Every time I come here I'd get so fascinated by not just the facts but also by how easily understandable Dave delivers the topic, to the point that I feel so eager to click the like button right after watching, only to find that I've liked it already!
@@raffia16thblaze10 Nope. He was making a point you can't see the singularity. Which is debatable but definitely not something we've ever done. A naked singularity could be anything, as far as we are aware, but not purely a point since it has spin, no one knows what shape or volume it has, if it even has one...
Professor Dave. I am a student of Anthropology and i never thought in a million years i could understand astronomy. I picked it up half a year ago to fill a hobby. and you have made it so easy and fascinating to study, i always take to my telescope after your videos man. Thanks a ton
@@spoodlydoodler3552 most of the time I will get angry when I see comments like yours but ill let you off since I just woke up and I don't have enough energy to get angry
Thanks.this is the first video on RU-vid which gives complete information about star formation,their life and death. I requested many RU-vidr to make videos on this topic
Love this channel. Getting ready to head to college for math and physics and always good to see someone informing people who chose to go another route in life
knowing about stars is my favorite hobby. i have seen tons of videos about stars and black hole, but you are too good. you deserves millions of subscribers
Professor dave I'm a teacher and I've got to hand it to you. You do such a good job simplifying difficult ideas that it's beautiful to see as well as being informative and enjoyable. Rock on :)))))
This is the best explanation that I've looked for in what happens with the atoms actually, when the mass is contracting that much, first atom pushing atom, then an huge nucleus of neutrons, then a black hole. Now I've figured out finally all, generally speaking. Thank you, that's light in my head now.
Plus Professor Dave is excellent at explaining complicated concepts in an easy to understand fashion... not a lot of people can manage that... especially without being patronising...my man is a star, pardon the pun...
That was incredibly fascinating and easily the best explanation I've seen for the formation and life cycle of the main planetary objects. You make it all very intuitive. 👍
This is the best explanation of the death of stars I have so far seen on youtube. I was always confused about supernovae, neutron stars and black hole formation. Now I feel I know a lot more and am less confused. Thank you so much for this informative video.
You are a saint. In school in order to graduate we need to make scientific paper about any subject that interests uns and I chose stars. Here I was about to cry because we have to use scientific papers to write it and source them and I understood nothing and your videos explained everything so well. (Also the way you narrate is extremely fun and engaging) I hope you have cold pillow for the rest of your life, that you are happy and successful and may life grant you all your wishes.
there is a lot more that going on in between these fusions cycles into new elements, also there is a difference luminescence between type of starts as well as the temperature they are burned at. however this is very good concise information on very lengthy and somewhat complicated topic. great job!
13:38f > _This object is called a black hole._ No, it's called _the singularity of_ a black hole. The black hole itself is the inner part of the point masse's gravitational field which is divided from the rest of spacetime by an event horizon. Note that this is just the simplest case of a SCHWARZSCHILD black hole which doesn't rotate which most black holes will.
This video is so impressive! It covers so many things that astronomy and astrophysics classes would have in a textbook, but it stays entertaining and fun to watch ^_^
Was literally looking for a video that explains this topic in depth..but my expectations were not meant to be fulfilled until I found this video🙌🏻thanks for sharing this video..
I have an Astronomy class this semester and the students teach each other so I am happy I could find someone to help me teach (not really me but 🤫) so thank you. 😂✌️
I learned all this in Jr college, but I have to give you credit with how you simplified it and made it so understandable. That's exactly why education works well with the right people doing the educating rather than a guy droning on endlessly saying "Mkay?" every 5 seconds. Thank you for your efforts.
*_EVERYTHING_* in the Universe, including ourselves, was made out of "dead" star material. *With the exception of Hydrogen and Helium, which were initially created in the aftermath of "The Big Bang" that created the Universe.
no, its made from within the Earth. The idea that its made from remnants of distant stars is a myth, a myth extolled by sheeple and believed only by other sheeple.
@@Tornadopelt sure, just give me a few million quid, like the establishment has given the astro-myth community $billions for the last 70 years to propound their nonsense, and i'll demonstrate matter creation and nuclear fusion with a small scale model of the Earth. the safire project team have already done it.
I was wondering - if the universe fell back and collapsed and expanded into / out of another big bang - could / would chemistry and physics be different that time? Or the distribution between matter and antimatter?
How are people not utterly breathtaken by astronomy? I'm glad I spent my childhood looking through a telescope and wanting to study the universe with my own eyes. Flat earthers clearly haven't done so enough.
Nah, they rather believe whatever they don't understand just makes no sense, and if it doesn't make sense to them it can't be right... and then imagine everything to be made of nothing but light, and all the beautiful special sky-lights must be very close to us because we're so goddamn special! That's why they can't accept the sun, moon and stars are millions and billions of miles away... It would make them feel a lot less special... They can't handle their own insignificance! So they keep telling themselves how special and important they are... I'm not familiar with psychology, but it could be some sort "defense mechanism" to avoid having an existential crysis.
Great job for this video! I find this video very valuable and explains information between useful and how to the professor can explain to the limit without using difficulty words in science for non-scientists. Thanks. It takes an “art” for information video and this young professor to stay in this limit of giving us the information without yawning. I give Professor Dave an A+.
I thought that an M-class star, especially the smaller ones, didn't experience a Red Giant stage? That they went to White Dwarf in a more "relaxed" manner if you will. Can you enlighten me on that ? I loved the vid; thanks !
Not me. The theory of relativity breaks down at the center of a black hole. People like to say "infinite density", including this video, but what actually happens is unknown, and the theory of relativity does not provide the answer. Black holes are fascinating phenomena and we are circling one right now! But it is not infinitely dense. It has a known mass and a known volume as well. Why not just calculate the density from that?
@@RetroPianoGuy Because all the mass of the black hole is on the singularity, which is infinitly small (planck length). How do you calculate density of something infinitly small =)
It is really helpful professor 🙏🏻... I am preparing for international space Olympiad and your video is the most satisfying and really really understandable video... Thank you sir...
This was very well explained. The images and animations you used to show it was "STELLAR." Get it? Overall, great video. You earned a new subscriber. Your videos are neat, and I feel like I could show these to my science teacher. Thank you.
I know you are dumbing it down for others but red dwarfs (the most common star) won't super Nova or even nova but they will live the longest and fizzle down like a piece of charcoal.
@@danyaverplak8910 Define "near" Sufficiently close, the tidal effects (the satellite bit closest to the start experiences a *lot* more gravity that the furthest bit) to shred it to a spagetti of dust.
This is one of the videos that make me remember how much I love astronomy. This channel is very cool for the amount of free information it just gives to you. And there are new videos being posted to this day too.
This is not regarding the video (which was very informative, thank you) but just regarding something that I was wondering. I read a summary of the formation of stars and they stated that the most abundant molecules in gas clouds are solid Carbon Monoxide and Hydrogen, and I was just wondering exactly what role the CO plays, if any, in the formation and normal life cycle of the star?
hmm, well once the cloud contracts enough for fusion to begin, everything is a plasma so there will not be any molecules or even intact atoms anymore, just nuclei whizzing around, so it's just that stars made from gas and dust with other elements in there besides hydrogen and helium should just have some larger nuclei to begin with. the rest is the same!
What Prof. Dave said. Plus, in the very first stars, there wasn't yet any C, O, or CO; clouds of just H and He formed those first stars. After enough high-mass, short-lived stars ended their lives, they injected those heavier elements ("metals" in astronomy-talk) into space, and later generations of stars had a little of that stuff along with the H and He when they formed. And as more and more of those stars entered their death-throes, later star-forming clouds were richer in "metals." Our Sun has a very rich spectrum showing us what's in it; its outer layers (photosphere & chromosphere) have trace levels of all kinds of elements. I haven't begun delving into Prof. Dave's video collection here, but I expect at some point, he might explain about absorption and emission lines in a star's apectrum. Fred
At 5:58 I don't understand why the core wants to eject all its energy by expanding in the giant red phase and why does it push the outer layers in order to do so? And how does expanding cause energy release?
Pretty good. Of course there were a few over-simplifications, which make it easier to understand for the people that can't do the math. For example, proton + electron --> neutron is not so much the electron being swallowed by the proton, as it is the energy of the electron being used to flip a quark in the proton, via the weak force. Well done on the stellar burning cycle yielding said elements. And Chandra was a terrible driver. I almost hit his car getting off Lake Shore Drive on the way to school. I think it was a black Mercedes. I love the story of his work on stellar nucleosynthesis. As he was mapping stellar spectra (every nuclear reaction has a distinct spectra), there was one spectra that didn't match up with any of the known reaction. Not one to be wrong, since he was sure that reaction had to be there, he dug up the original nuclear physics paper, and found a mathematical error. Correcting the math, the reaction fell perfectly in place. So much for that student's thesis defense comity. Oh the embarrassment!
One thing I found missing was that when star produce Fe in the centre the Iron starts to absorb the energy of the star which is needed in the war with the gravity that is not to collapse .So Iron is a star killer ! And because of it Star have to use all its resources to be alive that is making so much energy that it can't hold and go BANG!
