How Far Away Is It - 05 - Nearby Stars (4K)
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- čas přidán 8. 05. 2018
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In this segment of our video book, we take a look at our stellar neighborhood and how we know how far away these nearby stars are.
We cover the first stellar parallax measurement form the star Cygni 61. This includes the definition of ‘parsec’ and ‘light year’. We then cover the Alpha Centauri system (Proxima Centauri, Alpha Centauri A & B), and use it to show how we calculate the mass of binary star systems. Then we examine our stellar neighborhood including: Barnard’s Star with its Proper Motion, Wolf 359, Lalande 21185, Sirius A & B, 61 Cygni, Altair, Fomalhaut with its planet, and Vega.
A deeper look into what we mean by ‘luminosity’ is outlined. We point out that it is measured in watts just like a light bulb and that its value over distance from a point source follows the ‘inverse square law’. We use our Sun as an example and introduce Einstein’s famous “energy = mass time the speed of light squared” formula.
We then cover some more stars including: Pollux, Arcturus, Capella, and Castor. Having reached the limits of ground based telescopes to measure parallax, we discuss the European Space Agency’s (ESA) Hipparcos satellite and the more distant stars it helped fined parallax for including: HD 189733, Aldebaran, Mizar, Spica, Mira, Polaris, and Antares. Along the way, we build the mass vs. luminosity empirical graph.
We then cover the new ESA satellite Gaia that is mapping over a billion stars in the Milky Way and nearby galaxies. We follow that with a look at a few stars too far for Hipparcos but well within the range of Gaia: Betelgeuse, CH Cyg, and Rigel.
We end by pointing out that parallax only takes us to a small percentage of stars in the Milky Way and that we’ll need to know more about light to go any further.
Music
@0:31: Tchaikovsky - Symphony No 6, Pathétique IV Finale. Prague Festival Orchestra; from “Must-Have Adagio Masterpieces”
@10:40: Suppe - Poet and Peasant Overture: Hungarian State Opera Orchestra & Janos Sandor, Janos Sandor, Hungarian State Opera Orchestra; from the album Franz von Suppé: Poet & Peasant
@17:51: Puccini - Manon Lescaut - Donna non vidi mai - I have never seen a woman like this; Sofia Philharmonic Orchestra; from album “100 Must-Have Opera Karaoke”
@20:38: Schubert - The Trout from album “A Calendar of Classics - A 12 CD Set Of Romantic Classics For Every Month Of The Year”
In huge contrast to Alex Filipinko, Neil Degrasse-Tyson, et al, David Butler does not insult my intelligence. These are some of the most interesting, unpatronizing astronomy videos I've seen. The narration is excellent, and I enjoy watching them very much.
You're colliding against a fundamental problem of society, which is that intelligent and educated people have so much trouble comprehending lower intelligence and less educated people. And vice versa. He's not insulting your intelligence, which is very likely well above median, but
OOPS! Well since I'm committed by accidentally posting before I was sure I really wanted to say anything, I'll carry on by saying he only got about 9 sentences along before mentioning, without explaining, "parallax measurement." At that point he left most of the American population behind. The other presenters you reference are pitching to mainstreet and middle/gradeschool viewers who aren't up to your level. Nothing in media is aimed at "people" or society; everything is designed for slices of demographics that can be easily sold to sponsors.
Bryan Krussow ... The main difference here is that David Butler's videos are more aimed at people that have some background in science and astronomy, and Neil DeGrass Tyson is a popularizer of science toward an average demographic.
Neil has to seek metaphors that the general public has a chance of understanding. Some cause misunderstandings like "pear shaped" and "oblate spheroid". While true, the deviation from a true sphere is so slight that it cannot be seen in a picture of the Earth from space. Many lay people do not and will not understand this.
Carl Sagan was the best science popularizer. I do not think anyone will ever match Carl.
It’s all about the audience. If you find more general lay science an insult to your intelligence, I suggest you use your intelligence and only seek out information at more of an advanced science level. This has everything to do with you, and nothing to do with other experts who are speaking to different audiences.
He's super smart, don't ya know? Not like the rest of us dummies. This guy knows big words like parallax. No one else knows these words or their meanings.
I go to sleep listening to your videos. I learn a few things new things about our Universe and your voice puts me to sleep
pretty amazing when you consider how long stars live and how fleeting our lives are
Its depressing
It is really scary and depressing to put it mildly. I wish I could live as long as the sun ☀️ or 1 billion plus years
Quadrillion upon quadrillion upon quadrillion of years will pass after we are dead! Makes me sick to think how fleeting *I* am! 😔
@@drfoodstamps1604 We are eternal, don't worry, this body and life is just an experience.
Yes 😮 life is so short, but live forever by Jesus Christ
We are blessed to get this knowledge with you being such a calm and collected teacher. Thank you!
I agree fully such a calm, collected and soothing voice enchanted many curious students wish we had teachers like him
I dont understand most of it...but I love to listen and try to. Thank you for keeping my love of the cosmos lit like the flames of Prometheus.
He’s like the grandpa we all wish we had growing up
Cمحمد. harlie Tourniqنuet نغحج
Ummm... So are most of your teachers manic/irrate? ..
I like David too, but I don't think it's out of the ordinary for a teacher to be "calm and collected"...
It’s incredible to just know how much you can learn on CZcams with a pair of eyes some ears and a brain you sir have taught me a lot
What else are you going to learn with? What a goofy comment.
I watch and listen to David Butler s videos to fall asleep at night 🙂
best thing no ad
Cuz it boring lol
Me too
glenis thomas maybe you’d find Tiktok more your speed. David Butler videos aren’t boring to people who enjoy learning.
I just wanna be light years away when I hear it.
Excellent background classic music is perfect for the subject matter, as well as Mr. Butler's manner and style of teaching.
These videos are beautiful. Dave needs preserving like Attenborough.
You've given me a lot to think about, and plenty to learn.
Professionally presented with such clarity of topic.
IF only our College teachers could present topics to thus standard, we would have a greater number of high quality graduates.
Thank you
Miles
Best documentary film, voice is perfect for the video.
Earth is demonstrably level contained and motionless AND space vacuum cannot possibly exist ! Please grow up 😁
There's only 2 things I find wrong with David Butler videos.
Not enough of them, and rarely long enough!
Was excited to see this new video :)
1. I fall asleep during them.
2. I crack my head when it hits my desk
I think the term "parsec" is referenced in "Star Wars" movies, NOT "Star Trek" ("... the ship that made the Kessle Run in 12 parsecs ...")
@@N34RT Parsecs are, indeed, mentioned quite often in Star Trek genre. Obviously you have better things to do than watching old videos. Kudos.
@@user-bx7nw1ve6y Han Solo also talks about doing the Kessel Run in under twelve parsec. Despite parsec being a matter of distance, cause Han Solo didnt always know what he was talking about.
@@ynotenSolo also had a bad habit of exaggeration.
There’s NO WAY he could’ve made the Kessel run in that distance- especially with that hunk of junk Millennium Falcon
I was roaming around youtube in many physics channel that I can find. Until I find your channel. So your channel became my only physics channel to watch and study by then. Informative, genuine, full of real physics not bullshit like some others do. Thank you Mr Butler.
Physics is mostly bullshit based upon and built off other bullshit. It's why when we need real 'numerics' in quantom computing we fall into trouble...it's truly baffling how little we actually understand and how far off most science is...especially theoretical physics. Droves of college kids are learning bs to later build upon bullshit, teach bullshit to others, that literally will need to bend over backwards, create new maths, and put round pegs into square holes just to make sense of shit we can't sense.
I think so many billions of years are false,since as humans that we are, a million years, yes 1 million is an eternity,so dinosaurs were here on earth about 4 to 7 million years ago
@@FelIpe-gy8oo Funny how the only people in your corner are creationists and science deniers, what makes you think you know better than the worlds finest minds on the subject?
One way to prove you're wrong are stars that are billions of light-years away, the light you're seeing from a star a billion light-years away is like looking a billion years into the past...when you try to make science fit your religion all you're doing is perverting the science, and ultimately embarrassing and deluding yourself.
If u want physic with no bullshit and u were good on math on high school this channell is perfect to understand better:
czcams.com/users/PhysicsExplainedVideosvideos
I really appreciate this work you do. I watch the videos multiple times because there is just so much to learn. Thank you thank you thank you!
@Arizona person "biblical fact" is an oxymoron.
@Arizona person I'm embarrassed that you're from AZ too.
I promise guys, there are more intellectuals here than Bible thumping knuckle draggers.
MsMsmak I learned that some stars have periods.
*@MsMsmak* So true.....there's so much to take in , while entertaining at the same time .
I just found the channel, love it 😀
Great videos. I like the raw information presented, narrated calmly, without bombastic music, fast talking, bells and whistles. Reminds me of the superb old informative documentaries. This is how it should be done, thank you David.
I am so glad to have read this comment, though posted years ago, I find it a daily struggle to find informative videos that are not chalk full of audio and visual saccharine.
I’ve never finished one of his videos, this guys voice is better than melatonin.
The Basil history lesson is excellent. The link between parallax and stars creating their own light is a fantastic connection.
I rewatch these videos often when I'm bout to go to bed. So relaxing music and calm voice and very informative video .
All you videos are such a gift for generations to come. So well put together and soooo much to learn, and you voice are almost making us getting hypnotized haha. Wonderful! (Excuse my poor grammar, English is not my first language!)
This was the video that started it all for me. I figured I would get sick of it after watching it 5 times, but here we are.
Thanks David to share this! its a Jewel for all of us Who LOVE stars since childhood!!
Sometimes I watch this series while doing astrophotography. Usually while in the process of live stacking. Together they give a great sense of wander.
I admire your work, sir!
Great upload Sir. Really amazing details and great graphics.
What a fantastic documentary! You dont insult our intelligence by dumbing this down to elementary school level and you dont paralyze us with unconscionable vocabulary. EXCELLENT WORK!
4:57 that’s a rounded up version for those of you wondering light travels at 299,792,458 metres/second! for comparison sound travels at 343 meters per second!
Thank you so much for your efforts to produce this video and information for us all. all I can say is Woww!! My brain is numb right now and need to sleep to recover. Its amazing what humans have been capable about learning of our universe!
"The distance between Uranus and the Sun" - I'm sorry I couldn't help it. Back to seriousness, I love watching David's videos and am surprised that he hasn't more subscribers.
This is my favorite chapter of the video book
David butler is the fucking man. You my friend are what I watch before I go to sleep. Thank you for this.
Your voice trully relaxing and fullfill my brain with knowledge. I get it for free!!!. Wow
*The type of information you put on your videos is amazing. It's like you skim through and provide us with the most useful and interesting information and data.*
Content here is so well prepared, organized and presented. I can never get enough of learning this way.
Thank You.
Profoundly glad to have found your channel, Sir! You are incredibly didactic, logical and also a gentleman. I'm impressed. It's like I have no excuses whatsoever now to properly grasp some rather basic concepts I been misusing for so long. Cheers!
It's a joy to watch your videos Mr. Butler. So inspirational.
Just incredible explanation Dr. Butler. Great lectures we learn the way you explain all your videos. There is a lot to learn about the infinite universe, and the countless cosmological fenomena. I just wish we find signs of any kind of extraterrestrial life during the rest of my life-time. Hope that the James Webb Telescope carries out this immense task. Sure it will. 👍👍👍
Glad to be in your classroom sir. And thanks to youtube.
Hi Dr. David Butler, your work is amazing. I am not a Physicist by any means, i am a software engineer, and Physics is something that i want to study in the future. I think your videos are some of the best explanations of the many concepts of Physics,
ignore all the negative comments, there will always be haters. You should keep doing what you love, and i have watched almost all your videos, and learned a lot. Again, thank you for these video series, they are truly amazing.
There's an old sailor's saying, if you follow the curve of the Big Dipper's handle you can "Arc to Arcturus, then Speed on to Spica".
Amazing video. Thank you so very much for sharing this with us. We all truly appreciate it.
I'm glad I found your channel, thank you very much!!!
You explain the scope and size of the universe really well!
These are around the best educational videos out there...
Probably my favourite video of the series
This is the first time I've understood what parallax is... thank you Dave!
'Something in the water does not compute' my ability to learn this is now dilute. I lied I didn't understand this really. Kudos to those you who do.
Thank you Mr. Butler.
Fantastic information. Enjoyed the tour... specially GAIA updates
Wow what a Christmas present, I've just found these videos and have been binge watching them, they are awesome.
Many many thanks for posting them David, you've made a 55 year old Brit very happy indeed...Happy Xmas to all.
And a Merry Christmas to you too.
A superb video David. Thank you for your work.
Thank for your videos. Learning a lot from them.
You are so important for us... No words! THANK YOU!
Fascinating to put across so many facts in a readily understandable manner.
Many many thanks
I'm using a link to these videos in comments on other documentaries, showing the correct way to use music in documentaries. I haven't been to a movie in many years, but saw trailers and read that they now purposely have music that drowns out dialog. it's insane!! I did notice I had to struggle to hear the dialog for that trailer, and had thought it was a bad recording or something. Unfortunately, it seems documentary makers seem compelled to follow that horrible path, I guess to show how up to date their techniques are. Correct use of background music is just that. Background music done correctly adds to a documentary. It helps keep your interest on the dialog, not drown it out. Just dialog can put you to sleep. You do need both. And this guy did an absolutely amazing job and I hope he gets the opportunity to work on documentaries for the big producers like Discovery and NOVA or whatever is available now on TV, which I haven't had in years either....had to choose between my internet and a tv and it was a no-brainer. Thank you so much for this wonderful series!! It should be used in schools teaching how to make a useful and enjoyable documentary. By far the best I have seen.
Thanks.
I love your videos David! Something about the scene where you are in your backyard and you actually say “Here I am in my backyard looking at the Big Dipper.” That statement cracks me up! So awesome! Keep up the good work!
Amazing details , knowledgble , thanks ,from INDIA
Fantastic video, now I have to see the rest of your videos. Brb with a cup of coffee :-)
Your channel is gold! Thank you sir.
Excellent documentary. It is simple enough to understand and learn from.
I think everyone, and especially flat earthers, should be watching this series. It provides that basic foundation of education that most people either never received, or never paid attention to in school (if they went). This basic understanding of how our models work is something everyone should know and understand.
Extremely good explanation. Thanks.
Thanks so much for ur vids.... im so fascinated about the cosmos but always wondered how astronomers know how far a star is to us. Ur docs fully explains how they calc, easy to understand and most of all, it makes sense !!! Cannot wait for further updates... Thx again for ur work!
Thank you! You have a wonderful way of explaining amazing things.
Beautiful backyard !
You got a thumbs up for the mention of the great victory at Wolf 359.
thank you David, still very relevant and very enjoyable. it does make my head spin but just amazing
I really enjoy your videos. Thanks
TIL 1 parsec = 19 trillion miles... And a truckload of other interesting facts. Great video!
I have just discovered your channel,so glad I did,
Amazing simply clarification needy deeper things , Great Job
Beautiful.
Thank you so much no adds too thank you i love these videos
I am a passionate learner of astronomy, this is much better than crash course academy or PBS space time channel
Well scripted, excellent and humbling
Love your videos!!! They are awesome! I learn a lot!
Very informative- I like this video it explains much - but guys like me must watch it over and over to learn - still a great video.
Your videos are amazing. Thank you David
This is the first video I've seen of yours, and that's all I need to see to be a subscriber! I can't wait to see your other videos!
Thank you mr David Butler, you rock all space community.
I got first space bike so let's get out there ha.
I've waited for your video! Perfect timing:)
Great Video series! And I adore your music choice
I swear when he said at 6:32 "by a distance slightly greater than the distance between Uranus to........." I honestly thought the next words were going to be "your elbow" .
Splendid talk. TY
Excellent, every time I watch one of these awesome videos It corroborates Psalms 19:1,no other plausible explanation, Thank You - Ken
You mean fusion?
💩
you always have such a lovely music in background
Great to see the Gaia update!
Trout Quintet is particularly nice selection with these stars!
I listen to Mr Butler videos and my head explodes. I try to follow but his explanations are way above my comprehension level but I still try to hang in there
I should start by saying thank you , this is very enlightening.
Great work. Thank you sir
Great job
Thank you for your videos
Oh, how I wished I had a teacher like you. Wow!,
Excellent. Thank you
Stellar Odyssey👍
I have these on in the background while working, i missed his Star Trek reference until he mentioned the Borg..took me a second to refocus lol
Thank you teacher
I'm learning something from you teacher thank you
Excellent straigtfoward mathematical explanations, it may seem overly simplistic to some of us, as we're past this, but we all need to start somewhere
finally understood clearly what a parsec is. thank you !
Hey.....this guy is better than Star Wars.
I parsec is how much bullshit you can pile in a square acre. IE, "I crapped a parsec today, while talking about the universe".
@xc5647321 xc5647321 Excuse me, I meant while THINKING about the universe.
great documentation !!! : - )