How Far Away Is It - 05 - Nearby Stars (4K)
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- เผยแพร่เมื่อ 18 ต.ค. 2024
- Text - howfarawayisit....
Index - howfarawayisit....
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.
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"...
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
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.
It’s incredible to just know how much you can learn on TH-cam 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.
Excellent background classic music is perfect for the subject matter, as well as Mr. Butler's manner and style of teaching.
David butler is the fucking man. You my friend are what I watch before I go to sleep. Thank you for this.
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
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
You've given me a lot to think about, and plenty to learn.
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:
th-cam.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 😀
Thanks David to share this! its a Jewel for all of us Who LOVE stars since childhood!!
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.
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 😁
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 .
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
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!)
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!
I admire your work, sir!
Amazing video. Thank you so very much for sharing this with us. We all truly appreciate it.
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.
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!
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. 👍👍👍
These videos are beautiful. Dave needs preserving like Attenborough.
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".
This is my favorite chapter of the video book
Sometimes I watch this series while doing astrophotography. Usually while in the process of live stacking. Together they give a great sense of wander.
"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.
I’ve never finished one of his videos, this guys voice is better than melatonin.
Content here is so well prepared, organized and presented. I can never get enough of learning this way.
Thank You.
I'm glad I found your channel, thank you very much!!!
These are around the best educational videos out there...
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!
You are so important for us... No words! THANK YOU!
*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.*
Probably my favourite video of the series
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.
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!
Your voice trully relaxing and fullfill my brain with knowledge. I get it for free!!!. Wow
Amazing details , knowledgble , thanks ,from INDIA
You explain the scope and size of the universe really well!
A superb video David. Thank you for your work.
Glad to be in your classroom sir. And thanks to youtube.
Excellent documentary. It is simple enough to understand and learn from.
'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.
It's a joy to watch your videos Mr. Butler. So inspirational.
I have just discovered your channel,so glad I did,
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.
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?
💩
Fascinating to put across so many facts in a readily understandable manner.
Many many thanks
thank you David, still very relevant and very enjoyable. it does make my head spin but just amazing
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.
Thank you! You have a wonderful way of explaining amazing things.
I am a passionate learner of astronomy, this is much better than crash course academy or PBS space time channel
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.
Thank you Mr. Butler.
Thank for your videos. Learning a lot from them.
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!
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.
I really enjoy your videos. Thanks
Amazing simply clarification needy deeper things , Great Job
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!
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.
you always have such a lovely music in background
Fantastic information. Enjoyed the tour... specially GAIA updates
You got a thumbs up for the mention of the great victory at Wolf 359.
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!
TIL 1 parsec = 19 trillion miles... And a truckload of other interesting facts. Great video!
Well scripted, excellent and humbling
Your videos are amazing. Thank you David
Thanks for the Dates, you can see how important they are in forming a proper perspective of history; for example...
at 1:46 "In the 1830's there was a race to see who could find the first stellar parallax..." - and to think that most people today aren't even up to the mental speed of the 1830's (granted, this was the 'cutting-edge' mental speed of the 1830's, but nevertheless, most people today are still centuries behind in their grasp of reality... as for enlightenment, it is even worse - humans are still universally clueless (which is not a good thing - cluelessness is blindly destructive)... welcome to Earth...
Edit: A visualization challenge: visualize one arc second (the basis for 'parsec' in astronomy), which is 1/60th of 1/60th of one degree out of 360 degrees of a circle...
(now I wonder if there are any visual analogies out there on the web yet, like a fly speck on a basketball) (which would help, so I will look)...
ah, it is MUCH smaller - with the earth as the 'circle', one arc second is only 101.27 feet (30.48 meters) at the equator, which is too small see with the unaided eye from space... what about spy satellites? Best resolution: 150ft...
I'd like a better analogy, one with a smaller 'circle'... how about a clock face, each degree is 1/6 of a second on a clock, and an arc minute is 1/60 of a degree, with an arc second 1/60th of an arc minute... so you slice a clock's second into sixths, then you slice one of those sixths of a time-second into 60 slices, then one of those into 60 slices... so 1/60th of 1/60th of 1/6th of a clock's second is an arc second...
Which doesn't seem like a lot, and which doesn't seem to correlate with the earth analogy - roughly 100 ft. to roughly 24,000 miles, so it needs a math test - to see if the proportions are equal... (bringing up a spreadsheet)... an arc second of a circle (clock face) is 1,296,000th of the clock's circumference, or around 1 in 1.3 million... such a fraction of the earth's circumference is... (drumroll) 101 feet... so it adds up...
Therefore, if you can mentally visualize an arc second, you would be able to mentally visualize one item out of 1.3 million... not too shabby a mental capacity... (we aren't there yet, are we)...
Mr. Numi Who
ZZzz
Slave
Nice backyard
Great Video series! And I adore your music choice
Thank you mr David Butler, you rock all space community.
I got first space bike so let's get out there ha.
Splendid talk. TY
All this stuff is deeply fascinating. Even though we can measure and see locally we still cannot wrap our head around these stats. It's truly astonishing. Any one of those stars could harbour civilisations and no doubt do just like us here. I've had so many strange and uncomfortable reactions when I've tried to mention these incredible advances of understanding of the universe around us. So sad that so many can't see the wood for the trees. We are a minority my friends..peace!
This is the first time I've understood what parallax is... thank you Dave!
Beautiful backyard !
Bevis: "The distance between Uranus and the Sun."
Butthead: "Ha ha ha ha Ha ha ha Ha ha ha Ha ha!!!!!"
Just a little astronomical humor in popular culture!
I love your videos!
Ok....."but" ..this "Uranus" (where the Sun never shines ?) is so old hat......it's just not funny anymore ?
Thank you for your videos
Thank you so much no adds too thank you i love these videos
Slight correction. Light-year calculation is c x 60 x 60 x 24 x365.25 It uses the Julian Calendar, average number of days in a year.
It is 9460730472580800 metres (exactly)
Great to see the Gaia update!
I cant get my head round these vast distances . It's just mind boggling .
Excellent. Thank you
Trout Quintet is particularly nice selection with these stars!
I should start by saying thank you , this is very enlightening.
The stars we can see are all in our Milky Way galaxy. The other galaxies are a very long way away and we dont see individual stars without a telescope.
I didn't understand one damn thing said in this video but I still found it entertaining.
Great job
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" .
First, thank thank you for a wonderful combination of a beautiful music and very interesting presentation. Now a question, I read that even though Bernard star will come closer to Sun than the present position of the Proxima star, however, at that point Proxima will also move closer to our Sun, therefore Bernard Starr will never be the closest to our Sun. could you please comment on that? Thank you very much Anna.
Beautiful.
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
You, Professor, are the exact opposite of Neil Full-of-Himself Tyson... Your videos are fun. You speak clearly. I am inspired to take classes at N. Dakota Space Studies Program and teach. Currently, I am homeschooling my son, and I am using your videos.
One day Ph. Ds will come after my name...
Thanks Stephen. Say hello to your son for me.
Love your videos!!! They are awesome! I learn a lot!