I taught introductory Astronomy at William Paterson University from 2011 to 2020, and at CUNY Hunter from 2016 to 2018. In my years of teaching, I tried to make my class innovative and interesting, featuring unique assignments and activities. I've also created a series of over 100 videos covering most of introductory Astronomy. These videos are rigorous enough to be possibly used as a low-level, self-taught Astrophysics class.
Most of the videos on this channel are geared towards a full intro astronomy course. It contains all the content of a typical undergraduate course, and then some.
If you like what you see, please consider supporting me through Patreon.
Excellent ! Re dark matter.. Neil Turok suggests that the dark matter particle is a heavy right handed neutrino (as a result of one of the left handed neutrinos being zero mass ). If the zero mass is established in next few years he could be onto something !!
Jason is a person who I like without limit. He is guiding us through the theories that exist. Nothing more. And as such you should listen to him as the most efficient way to get current. His plan seem to be in the fold .... good plan .... anyways he read up on everything he is saying.
@@JasonKendallAstronomer I listen to you and other channels through sleepless nights cause I have some medication but my brain refuse to sleep. ANYWAYS forget that. My interest lately has been how everything has been established. The lewit cephids the parallax as a technician and a perfectionist eliminate the errors. So here come Jason and tell us how hard they are trying.
maybe Jason as a side show can delve into what pawed the way to these discoveries. It is all technical I am sure but as a technician I am not afraid, Cause I am trying to figure out why they know what they know,
I am becoming increasingly convinced of higher quarks being found in the quark/gluon soup found at the cores of neutron stars. Their energy being sustained by the gravitational contraction as they ecrete matter at the surface. There is however, only theories, no way of ever proving it. But like the dubious, mathematical failure of the singularity at the cores of BH's, it makes most sense to me if there were. Great lecture Mr. Kendall, thank you.
Isn't escape speed affected by surrounding bodies? If a particle left a planet at fractionally below "traditional" escape velocity, but is heading towards another body, it may end up in the far bodies gravity well before it falls back to the home planet and it would eventually impact the far planet. If that body WASN'T there, the particle would eventually fall back to the original planet.
It's so tragic that 90% of the population has 10% of the star light in cities and surrounding light pollution. In truly dark areas you can see the "milky way".
silly question but at 1:08 you say he took a loop of wire and passed a magnet over it, and then you take a volt meter - wait how did they get a volt meter if they had yet to discover current?
Mr. Kendall, The composition of the Earth's Core seem consistent with that of Supernova to me. Or other Stars that create those elements. Wondering if it would make a good Thesis. I don't suppose we yet know if there are other planets with a similar core composition to that of Earth. Is it possible that the Earth was once a star that blew it's outter layers off ? The rents paid for life if necessary and I seem to have time to do this now. Wait we could tell by the planets magnetic field around it couldn't we ? Somewhat ?
Interesting thought, but no. The core of the Sun, or any star, is far more dense than the core of any planet. The way planets form is well-known, and is observed happening around other stars, with particular interest in proto-planetary disks seen in the Great Nebula in Orion. Keep it up!
So humans first noticed Betelguese as a bright yellow star which then turned red. So it went from a main sequence star to a red giant. Now people are afraid it will go supernova when in reality it just recently turned off it's cno burning. While it could blow up any day it is less likely now that it went from cno cycle to now red giant which means it is close to being hot enough to form even higher elements so yes it could.
A shock wave is a sudden increase in the density of material. However, the material outside an immanently collapsing massive star is an extremely tenuous plasma not a vacuum. See images of Eta Carina for an example.
Loving the videos but triggered @3:11:44 as there is no possibility that Gobekli Tepe is merely the start of the neolithic. That is non-sense reminiscent of those that denied plate-tectonics.
It's ashame it was taught earlier in primary school. I really had to dig to find this stuff when I was young. Solar Masses where different. Every once in a while National Geographic would do a special on it.
Arp was shown to be incorrect a long time ago. For those following at home, Arp came up with some amazing observations that tried to show that cosmological redshifts can't work given some quasar's proximity to galaxies, as well as "streamers" and other things. However, later Hubble Space Telescope imagery and now JWST images show that all the "anomalies" were actually due to the low resolving power of ground-based telescopes, and Arp's own selection effect of being really good at finding photogenic colliding galaxies. Now we know that most galaxies undergo mergers, and that quasars suffuse the cosmos, making line-of-sight conjunctions seem to be significant, when in point, they are not. SDSS quasar surveys, as well as direct imaging of quasars' surrounding galaxies have put to rest Arp's quest to deny cosmological redshift.
You're an excellent teacher. A lot of people might take these findings for granted but you're like a wizard, and somehow I understand what you are saying because you break it down and reiterate it very well. The gravity of these considerations actually blows my mind and is changing my reality.
19:01 When electrons in the core get degenerate, could them be called/imagined as a kind of electron-crystallization instead of "eL-gas"? And to continue the analogy, could the He, H, Metals be called the Alloy_elements of the Electron-"degen"_Crystal? just as some very old Carbon_(reddening)WhiteDwarfs can be called (very hot(monocrystalline?)) diamonds!
Great Lecture; I watched Your RU-vid about Sun's Fusion and Neutrinos, The Solar Neutrino Problem. I'm also a fan of (physically possible, though technical hard) SciFi: Lofstrom LaunchLoop (quasi_continuous ballistic, realistically only possible on the Moon) or Isaak Arthur's "Extending the Sun's Lifespan" (to 75E9yrs, by lifting He, the ash of fusion off from the photosphere (together with other metals) and thus, by diffusion, purifying the hydrogen fuel in the core); ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-cw20VbX1XCc.html albeit this would be a humungous effort and it could "backfire environmentally" in the way of permuting this calm G2_V star into a wildly flaring K or M- type (by changing opacity at the least)!!
How much energy is emitted by the Sun in form of Neutrinos, compared to (Light/Heat/)_Photons, relative to each other and absolutely in Watts? same Q?: how many Anti-Neutrinos are coming out of a 1300_MW_el nuclear fission reactor, LWR? Since they carry impulse and energy, how much energy in MW would that be? based on the best estimate of their tiny mass? At which minimum distance from such a standard LWReactor would the (added Anti-) Neutriino-flux spread out and be about 50% of the Solar neutrino flux? Would it be of any reasonable bio&genetic importance? (maybe a not unimportant question for someone who considers buying a house in that neighborhood?); could a single Neutrino flip a computer_bit? 3rdQ?: would solar neutrinos and reactor_anti_neutrinos annihilate? (occasionally) or Don't they annihilate with their Antiparticle at all, because how could they emit anything?
Homogeneity? Do you really want to assume the universe's gender preference and pronouns? Maybe they/them identifies as chaotic. Serious question: why do radio galaxies play such lousy music? This channel is the best.
Hey you got on TV? That's awesome :) I have a question for you. Knowing what you know, having a sense of consciousness that understands these elliptical objects wildly whirling around us at terrific speed, while our planet itself revolves and orbits the sun... How do you comprehend your relativity? Do you feel like you are still - or do you have a connection to these motions that gives you a feeling of constant motion?
It usually depends on whether I had espresso or matcha that morning. In all seriousness, these motions are not physically detectable by your or my inner ear or other bodily senses. If they were, there wouldn't have been such a massive battle about them over the ages. It's a triumph of the abstraction of thought, and making the simplest possible explanation for celestial motions. Sometimes, flat-earthers comment on this channel with various "if I can't see it" or "I can't feet it" arguments. But they are always woefully under-imaginative. They really believe that eye-witness accounts are the Most Reliable Explanations, but they forget the "Monkey walks through a room of people throwing balls" experiment. Your eyes can be easily deceived, and that's only because of how we look for things due to 65 million years of evolution. Anyway, on a very dark night, when I watch the stars for a long time while at my telescope, I sometimes start to "feel" the motion of the Earth. And that's because I've become so dark adapted and have been standing so still in one place, that the stars' motions become the only thing I can clearly see move. Then, and only then, do you start to feel the wonder of the celestial motions.
@@JasonKendallAstronomer Thanks for your answer, I was angling for some kind of insight into your ability to tune into to those imperceptible motions merely from having them in your conscious cognitive repertoire of forces acting on us. I won't even comment more than this on flat-earthers. If I can ask you another question, do you think we are trapped here on earth and this local vicinity or will we find a way to travel astronomical distances in space someday? And, one more, do you think space is infinite or finite? I am loving your videos, hope you don't mind the questions.
@@user-pw9bh8vw4t I think that one day, if humanity doesn't do itself in with war, or retreating into ignorance, people will at least colonize the Moon and Mars. Getting to the next star will almost certainly be the purview of complex robots. The kind of people who will make interplanetary journeys on one-way trips will be of a singular character. I have no idea what that would be like, but if history informs us at all about it, it might be hyper-religious people longing for freedom of belief, and escaping dominant societal oppression. If that's the type that will willingly and eagerly go, then that's great. If I'm wrong, and it's others, that's great too. I really don't care who does it, where they are from, what they believe. It's that some group should do it, for the sake of all (whether that's their intention or not.) For fun, have you read the Mars Trilogy by Kim Stanley Robinson? He explores such people in great depth and compassion. It's great fiction.
@@JasonKendallAstronomer Thanks Jason. I'm wondering what if anything can be done to extend human life beyond its current miniscule span. Since the distances are beyond comprehension even at lightspeed Earth might collapse in the interim of arrival, if not return. I think our best bet may lie with some kind of quantum entanglement amplifier which supersedes Time and eliminates our need for using our physicality as a vehicle. No, I've not read that, I will look for it. In my own field of specialty making a new type of individual suited to galactic space faring is also of great interest. I am certain such individuals would have to be created through bioengineering if they don't emerge naturally. Thanks a lot for your time Jason, I see how much effort goes into all your videos and just wanted to show my appreciation. I am really enjoying them, thanks!
I love your straight-forward, well-informed approach without gimmicks and cut-ins or extraneous commentary. It really appeals to me as a novice trying to get a handle on astronomy, and I feel like I am learning a great deal from these videos. Thank you so much!
the Henry Daper colour chart for planet spectra you showed you could make out a pattern, eddies almost. then what if we had a coloured light source, for as many different pigments and each pigment a coloured light source, could these beams then focus on a single point? just a curious thought
The best teachers are those who have a genuine passion for the subject, and I haven't seen cosmology so eloquently discussed in such an easy to understand way since Carl Sagan.
I've remastered it, and you can watch it here: ru-vid.com/group/PLyu4Fovbph6e0oPk9ch3q2II9a8BT8gfL Also, I want to completely re-record it anyway, and that's in the works.
@@JasonKendallAstronomer Wonderful. Thank you for the time and effort you are putting into this content. It's very well written and valuable content. You do a great job writing in a way that appeals to the people who know the science well as well as the people who have never learned about it before. Keep up the incredible work (but only if you want to)
