Mr. Butler....you have seriously touched my life. I’ve spent about 35 hours watching your videos over the past few weeks and I must say your teaching style doesn’t push information but you rather reveal information in layers so that it can build on-itself. I just wanted to say I really appreciate what you do. You make me proud to be a human being....corny as that sounds I mean that.
I said something similar about human beings, ha, Mr.Butler does strike me as an outstanding human being, this is what cool should be in our culture, imagine how much better humanity would be, is it possible to greatly reduce immaturity and just like the wonder Mr Butler feels when learning something new, we need to show behavioural learning is the same wonder of the mind.......that make sense?
My favorite too... Its the only channel that actually expects us to try to learn and understand. And not dumb it down for those who have the attention span of a goldfish.
Another set of youtube vid's that are a good listen /zzzzn is VAUGHN HEPPNER's "" THE LOST STARSHIP"" series on audiobook ...check it out... 8 of the 12 books are posted on youtube
Doing exactly the same for years with various documentaries about astronomy & cosmology... ...it turned out that David Butler is the best checking all boxes I'm looking for: Getting to learn everything about astronomy in detail AND finding sleep sweeter than honey...!
Remarquable travail de vulgarisation. Les images sont expressives, les explications nettes et concises et le fond musical bien choisi. Merci David c est superbe ! Je continue la serie .
One of the best lecture series on Astronomy-- I am a professional doctor -- and it is so absorbing even to me -- our children need to listen to these -- Sir 🙏
Hello David I'm an amateur astronomer for 40+ years now, and I just really have to applaud your astronomy video series. I've watched a lot of these astronomy videos from other sources and channels, and without any doubt, yours are the best I've ever seen. Your presentation of the material and explanations have given me a new light (no pun intended) on my hobby. I have a 12.5 inch Meade research series reflector, and I'm now planning an observatory to house it. I also had a career in the electronics field too. Thank You very much for your intelligible hard work
David your a leader, I said so before, your up there with the greats, its sad we cant keep you forever. You are an insperation to the next generation, a long term thinker, and I for one, thank you.
What you gave to humaity, cannot be paid in money. Unfortunatly not all of us understand that, we won't. Not for a few more generations. Love u,, your my bro, I for one, appriciate how your trying to protect us.
Now THIS episdode is chock full of info. I'm following the Math and still had to stop and start to understand H-R Diagrams and the relationship between temperatures Luminosity and Brightness. I spent about 3 hours on this video and loved every moment of discorvery and adventure. It really is an awe inspiring Universe we live in and to think it's just ONE universe. There may or may not be more. I personally think there are, but our universe is so expansive, so ingrained with stellar product that it's mind boggling.. This is an incredibly insightful series and good companion to the other video series youve produced like higgs-boson and how fast/slow is it , most of which I have seen but have not studied with as of yet. I am in a part of Texas where petrochemcial smog blocks the night sky too often I am grateful for the effort and passion you exerted in producing these great videos and they have become part of my study routine. 🙏🏿
I surmise that David enjoys himself a bit of Pink Floyd every once in a while! All of "Us and Them" derive much enrichment and education from your work. Thank You so much for your time and effort!
Thank you Robert Butler. You did a thorough job of explaining astronomical concepts! Most astronomical videos on line are more entertainment than education.
David has such a beautiful way of explaining all matters concerning astronomy it is a joy to watch and listen, I had seen the H+R graph many times but had no real idea of what it signified, but David explained it perfectly in this video, I'll now know exactly what I am looking at and what it represents in future. Many many thanks for these videos David, your expert narration and superb musical accompaniment make these videos a joy to watch.
As the presenter states, H-R diag is Spectroscopic Parallex, tool to estimate how far away the stellar objects are based on objects' luminosity, I think.
I love the slow pacing delivery of your videos. Most astronomy videos, people who explained it talked way too fast and too excited I couldn’t follow much.
This part about quantum mechanics (emission and absorption of light by atoms in a gas) is very interesting. The atoms in a gas will only be excited by light with the right frequency and thus energy content. This depends on the gas composition. Thus, when that happens, the photons transfer their energy to the electrons in the atom, which jump to a higher orbit around the nucleus (absorption). When the electron returns to its original position, it emits light of that same frequency (emission).
As always, great content. I was wondering: at 15:58 it says Betelgeuse is 724 light years away but all other sources I've seen agree it's about 640. How can we verify?
Your videos are the best on the field of Astronomy, Astrophysics, and Cosmology. Excellent work, very organized, clear to understand, and very deep in details. Thank for your valuable collaboration to understand our amazing Universe. :DAV:D, My name is :DAV:D too.
David has such a beautiful way of explaining all matters concerning astronomy it is a joy to watch and listen, I had seen the H+R graph many times but had no real idea of what it signified, but David explained it perfectly in this video, I'll now know exactly what I am looking at and what it represents in future. Many many thanks for these videos David, your expert narration and superb musical accompaniment make these videos a joy to watch.
Fascinating ! One wonders though what happens in planetary nebulea that decides the size and mass of stars ? Why such super giants like Aldebaran ? A more dense nebula cloud (more gas and dust) ?
Re-taking interest. Production, voice, visuals so superb, lures you back for more. Sitting across from David, would ask two fair and geniune questions? 1) Do you expect to see (humanoid) alien life during your lifetime? 2) Would the Math get you barred from Gambling in a Casino?
How can luminosity give you an accurate distance calculation of a star when the star can suddenly become brighter or dimmer all of a sudden without moving - doesn’t that throw off the distance calculation? - thank you and great videos!
5:45 "our own sun is yellow" : wrong, our sun is white. Peak in green wavelenght. It looks yellow to red behind thick atmosphere of sunset. In space it's looking verily white and not yellow AT ALL.
Truthfully, astronomy kinda went over my head, I'm very intelligent but the distance and time are so vast, it's hard to put in perspective, but you explain and show graphs that detail so I can understand, great job of bringing down to earth, so to say.
U are awesome, I'm so happy to have found this channel, I'm Pretty well educated, but David can teach me so much more, keep it rolling Dave, my goodness
Why do star colors rise with temps along the color spectrum, red-orange-yellow, but then go white where green would be on the spectrum, then return to the color spectrum with blue? Is the partial matching of the color spectrum just a coincidence?
The white light spectrum through a prism always seems to show distinct boundaries between the ROYGBIV, but isn't this misleading? I would presume that the color changes are continuous rather than showing discrete intervals. Am I correct?
Mr. Butler....you have seriously touched my life. I’ve spent about 35 hours watching your videos over the past few weeks and I must say your teaching style doesn’t push information but you rather reveal information in layers so that it can build on-itself. I just wanted to say I really appreciate what you do. You make me proud to be a human being....corny as that sounds I mean that.
Thanks.
I said something similar about human beings, ha, Mr.Butler does strike me as an outstanding human being, this is what cool should be in our culture, imagine how much better humanity would be, is it possible to greatly reduce immaturity and just like the wonder Mr Butler feels when learning something new, we need to show behavioural learning is the same wonder of the mind.......that make sense?
Sean Robertson and Kirsten Kirby of new canton Illinois molested there daughter lyndon Robertson
David reminds me why I loved astronomy so much as a kid. Great channel, and helps me escape my meaningless corporate life on the hamster wheel.
Best TH-cam Channel discussing astronomy
This series is a treasure of astronomy from a experienced astronomologist, benefiting the world.
My favorite space science channel by far
My favorite too... Its the only channel that actually expects us to try to learn and understand. And not dumb it down for those who have the attention span of a goldfish.
@@samkolkka7084 thats insulting to the gold fish. :-)
Every single video is amazing. Even the ones I think will be boring are mind blowing.
No one makes videos like these. So in depth and full of detail. Beautifully made. Love the How Far Away is It series.
Mr. David lectures are Gold.
Relaxing and learning before you sleep. It is a win win situation.
Another set of youtube vid's that are a good listen /zzzzn is VAUGHN HEPPNER's "" THE LOST STARSHIP"" series on audiobook ...check it out... 8 of the 12 books are posted on youtube
@@billwheeler7243 cf
Exactly what I'm doing now. Lol
He does have the kind of voice that pits you to sleep.
Doing exactly the same for years with various documentaries about astronomy & cosmology...
...it turned out that David Butler is the best checking all boxes I'm looking for:
Getting to learn everything about astronomy in detail AND finding sleep sweeter than honey...!
Kudos for perfect pacing on these videos, Mr Butler. I appreciate having my mind expanded/blown at an easy tempo.
I thought the exact same thing. Perfect flow of information with explanation.
@ابو ليث الخطيب fuck you and your pedophile prophet
Remarquable travail de vulgarisation. Les images sont expressives, les explications nettes et concises et le fond musical bien choisi. Merci David c est superbe ! Je continue la serie .
The ease with which you have made technical concepts easily understandable is amazing. You are an excellent teacher. Long life and health to you!
i spent a year trying to learn this shit from school and here comes David to blow my mind in 27 mins
god bless you David, you're the best
This series is great.....minimum “ showbiz, maximum info -- thank you
Real science based solely on facts and a hint of exploration curiosity .. absolute space heaven
One of the best lecture series on Astronomy-- I am a professional doctor -- and it is so absorbing even to me -- our children need to listen to these --
Sir 🙏
Yes!!! I have been watching these videos all week, now I can in 4K.
Hello David
I'm an amateur astronomer for 40+ years now, and I just really have to applaud your astronomy video series. I've watched a lot of these astronomy videos from other sources and channels, and without any doubt, yours are the best I've ever seen. Your presentation of the material and explanations have given me a new light (no pun intended) on my hobby. I have a 12.5 inch Meade research series reflector, and I'm now planning an observatory to house it. I also had a career in the electronics field too.
Thank You very much for your intelligible hard work
John, Thanks for your note. I love it that you can build an observatory. David
This is an excellent series! So well explained!
This channel has such awesome content. Thanks for making these videos!
Mr Butler, yours is the probably best made and most informative series on the subject among all. Appreciations.
David your a leader, I said so before, your up there with the greats, its sad we cant keep you forever. You are an insperation to the next generation, a long term thinker, and I for one, thank you.
What you gave to humaity, cannot be paid in money. Unfortunatly not all of us understand that, we won't.
Not for a few more generations. Love u,, your my bro, I for one, appriciate how your trying to protect us.
we cant all protect the president, and take that bullet, you have, with so much class I could puke.
Thank you Lloyd for your kind comment. I appreciate it.
The greatest channel on TH-cam. By some incredible measure. Love
I hate commercials/ads but having to watch one or two to watch this is biggest deal I can imagine in educational entertainment.
Thanks. I do provide a music free (and therefore ad free) version.
You have a great voice for presenting this topic... fit for a planetarium talk.
Covered a lot of ground, simple and thorough. Thank you much!
17:24 David: "Here we see the superhot star WR 124."
Me: *tips hat* M'lady
Best channel on space and astronomy, much better than PBS spacetime.
Now THIS episdode is chock full of info. I'm following the Math and still had to stop and start to understand H-R Diagrams and the relationship between temperatures Luminosity and Brightness. I spent about 3 hours on this video and loved every moment of discorvery and adventure. It really is an awe inspiring Universe we live in and to think it's just ONE universe. There may or may not be more. I personally think there are, but our universe is so expansive, so ingrained with stellar product that it's mind boggling.. This is an incredibly insightful series and good companion to the other video series youve produced like higgs-boson and how fast/slow is it , most of which I have seen but have not studied with as of yet. I am in a part of Texas where petrochemcial smog blocks the night sky too often I am grateful for the effort and passion you exerted in producing these great videos and they have become part of my study routine. 🙏🏿
Dear David, I appreciate your fascinating videos on astronomy. Your voice is charming and magnetic.
Mr Davide so difficult topics made easy to understand by you. This creates more enthusiasm in most of viewers to learn more and more. Hats off to you.
this guy is better than any science teacher i ever had and not boring at all!!!
I surmise that David enjoys himself a bit of Pink Floyd every once in a while!
All of "Us and Them" derive much enrichment and education from your work.
Thank You so much for your time and effort!
was wondering if anyone else caught that
Very well produced. Outstanding graphics. Explained so even I can grasp most of it.
Mr. Butler is the best space science teacher ever.
Loved the use of classic music in the background. This video hits on my subconscious.
Thank you Robert Butler. You did a thorough job of explaining astronomical concepts! Most astronomical videos on line are more entertainment than education.
I can't get enough of these videos, this one along with local galaxies, I watch daily
David has such a beautiful way of explaining all matters concerning astronomy it is a joy to watch and listen, I had seen the H+R graph many times but had no real idea of what it signified, but David explained it perfectly in this video, I'll now know exactly what I am looking at and what it represents in future.
Many many thanks for these videos David, your expert narration and superb musical accompaniment make these videos a joy to watch.
As the presenter states, H-R diag is Spectroscopic Parallex, tool to estimate how far away the stellar objects are based on objects' luminosity, I think.
absolutely best channel on youtube.
Really the best nuts and bolts explanations I’ve come across. Just excellent!
Dear Sir, thank you very much for this fantastic documentary. I wish you all the best and greetings from Verona - Italy.
This is remarkably good, one of the best reviews I have ever found. The clarity and scope are brilliant. Dr. Reid oncology
Wow…the way you explain things By far the best educational video I’ve seen no b.s. no upselling products thank you 10/10
Absolutely brilliant. I do believe I'm about to binge watch the rest of the series. Thank you fir your hard work.
Sir David, thank you for these videos. Love and respect from India❤
I love that you are updating not just the video quality but also the content of your old videos. Thank you so much for the great work.
Your illustrations and visuals are so far best, very easy to understand. All other docs are fuzzy
The best channel for the space enthusiasts
I love the slow pacing delivery of your videos. Most astronomy videos, people who explained it talked way too fast and too excited I couldn’t follow much.
With the cliche dialogue for Black Hole "That even light cannot escape " 😡😡😡🤬🤬🤬
True sir. The presenter set a bench mark as to how to explain scientific aspects in an easily understandable manner to all including physicists.
Found your channel 2 months ago, I wish I had done so earlier. I watch your videos everyday before going to bed.
This part about quantum mechanics (emission and absorption of light by atoms in a gas) is very interesting. The atoms in a gas will only be excited by light with the right frequency and thus energy content. This depends on the gas composition. Thus, when that happens, the photons transfer their energy to the electrons in the atom, which jump to a higher orbit around the nucleus (absorption). When the electron returns to its original position, it emits light of that same frequency (emission).
David Butler is my hero. Great information and so well presented!
As always, great content. I was wondering: at 15:58 it says Betelgeuse is 724 light years away but all other sources I've seen agree it's about 640. How can we verify?
To fly over there and measure a bit more precise along the way 😅
Thank you for showing the Dark Side of the Moon-Cover at 2:37. 😊
Very well presented. Fantastic job.
Fantastic educational video Sir!! I learnt a ton on the subject in this 27:26 minutes. Tons of respect for your knowledge and oratory skills.
Brilliantly done - priceless work - I'm thankful
6:03 why no green stars?
Your videos are the best on the field of Astronomy, Astrophysics, and Cosmology. Excellent work, very organized, clear to understand, and very deep in details. Thank for your valuable collaboration to understand our amazing Universe. :DAV:D, My name is :DAV:D too.
I wish I learned this in High School. Simply great channel and I love the history.
Complex ideas broken into understandable pieces. Thanks!
I never knew that colors get more confusing
This was very helpful I learned a lot
I never cared for science and this is as interesting as anything I've studied. Thanks, Professor.
You've done something very good here. I think I might subscribe. Thank you!
This is an incredible series. It reminds me of some of the information I was exposed to in astronomy class in college. Thank you for sharing.
David has such a beautiful way of explaining all matters concerning astronomy it is a joy to watch and listen, I had seen the H+R graph many times but had no real idea of what it signified, but David explained it perfectly in this video, I'll now know exactly what I am looking at and what it represents in future.
Many many thanks for these videos David, your expert narration and superb musical accompaniment make these videos a joy to watch.
Amazing work David. Thank you.
Wow... explained very clearly... It reminds me of several of my university professors at Queens borough community college... back in 1984
Outstanding effort David, Thank You very much. Cheers Kev
Thank you for making these posts.
Love your channel,keep teaching us,and we will keep watching.
Fascinating ! One wonders though what happens in planetary nebulea that decides the size and mass of stars ?
Why such super giants like Aldebaran ? A more dense nebula cloud (more gas and dust) ?
David, you're the best buddy.
Well explained in a relax n calm manner.. take a bow sir :)
Thank you so much Mr. Butler. I gained more knowledge in science from your channel than in my entire life as a degree holder. Your works are awesome
Thank you very much Mr Butler. Very interesting !! I have get enough of your explanations
I have
God bless you, Mr. Butler
Mr David Butler your very good and thank you being very good teacher
these series are soooooo damn good, excellent job
Best of the Best
Thanks Mr. Butler
I’ve got virtually no idea what he’s on about. But I love listening to it.
He is just speaking experimentally verified truths.
Re-taking interest. Production, voice, visuals so superb, lures you back for more.
Sitting across from David, would ask two fair and geniune questions?
1) Do you expect to see (humanoid) alien life during your lifetime?
2) Would the Math get you barred from Gambling in a Casino?
Thanks for your explanation and it's always great but somewhere in me very deep question about luminosity and speed.
Mr Butler ur one of the best at what u do;Thank u so much;
At 13:35...sulfur should be listed ahead of iron....
What a great man you are sir....kudos
How can luminosity give you an accurate distance calculation of a star when the star can suddenly become brighter or dimmer all of a sudden without moving - doesn’t that throw off the distance calculation? - thank you and great videos!
Over time you get an average luminosity reading. That takes out sudden changes from time to time.
@@howfarawayisit - Thank you sir - I should have thought about that a bit longer.
5:45 "our own sun is yellow" : wrong, our sun is white. Peak in green wavelenght. It looks yellow to red behind thick atmosphere of sunset. In space it's looking verily white and not yellow AT ALL.
Truthfully, astronomy kinda went over my head, I'm very intelligent but the distance and time are so vast, it's hard to put in perspective, but you explain and show graphs that detail so I can understand, great job of bringing down to earth, so to say.
Sorry!!! I have Not get enough of your explanations !! Never .excuse my bad English
6:08 - why do we see red, orange, yellow, and blue stars...but not green stars?
Interesting answer: en.wikipedia.org/wiki/Green_star_(astronomy)
We see a mix of light frequencies - mostly those around the peak transition color. But the mix around green is interpreted by the brain as white.
Wondeful presentation Sir!
Awesome videos! One question, how does the colour emitted go red, orange, yellow, white, blue? Shouldnt it not go red, orange, yellow, green, blue?
As the peak emission becomes green, it is surrounded by adjacent colors that, when combined with green, look white to our eyes/brains.
U are awesome, I'm so happy to have found this channel, I'm Pretty well educated, but David can teach me so much more, keep it rolling Dave, my goodness
You have great voice for this.
Thanks for the great efforts to simplify this science for us
GREAT JOB DAVE!!!
What an Excellent teacher!
Why do star colors rise with temps along the color spectrum, red-orange-yellow, but then go white where green would be on the spectrum, then return to the color spectrum with blue?
Is the partial matching of the color spectrum just a coincidence?
This one video has spectacular content.
The white light spectrum through a prism always seems to show distinct boundaries between the ROYGBIV, but isn't this misleading? I would presume that the color changes are continuous rather than showing discrete intervals. Am I correct?
There are no lines between colors in a stars spectrum. It is continuous. You are correct.