PARSECS, Light Years, or AU? (Astronomy)
Вставка
- Опубліковано 30 чер 2024
- Our Socratica Astronomy series is back! Bookmark the playlist here:
✷ socratica.link/Astro_Playlist
We also ask you join our STELLAR email list so we can notify you when new videos go live:
✷ snu.socratica.com/astronomy
(Don’t rely on the YT algorithm to show you what you’re really interested in!)
✵✵✵✵✵ Units of Distance in Astronomy
Light Years, Parsecs, AU (Astronomical Units) and kilometers
We’re familiar with kilometers (and miles) as measures of distance here on Earth. But when it comes time to measure distances of heavenly objects, it makes more sense to use the units AU, LY, and PC. That is, Astronomical Units, Light Years, and Parsecs. That’s because space is REALLY big!
Today we’ll examine these units that are most commonly used to measure distances in space, and when it makes more sense to use one rather than another. For instance, did you know that astronomical units (AU) are typically used for within our Solar System? But the distance to our nearest star, Proxima Centauri, is so huge that we really do need to jump up to using either Light Years or Parsecs. You'll even hear the terms megaparsec and gigaparsec!
✵✵✵✵✵ CHAPTERS
You can jump to chapters in the video here:
0:00 Introduction to AU Astronomical Units
0:33 AU Distances to planets in our Solar System
0:49 Using Light Years (LY)
1:05 LY in km
1:28 Proxima Centauri
1:37 Orion Nebula
1:52 Using Parsecs (PC)
1:57 PC in LY
2:07 Parsec name explanation
2:22 Parallax demonstration
3:23 What is an arc-second
4:15 d = 1/p
5:35 Challenge Question
You can check your work on the Challenge Question on our website:
www.socratica.com/lesson/astr...
✵✵✵✵✵ THANKS TO OUR SOCRATICA FRIENDS
This video was made possible by the generous support of our VIP Patrons on Patreon. What a blessing it is to have support from people who care about education! Let's take a moment to recognize these lovely souls:
Alvin Khaled, Carlos Araujo, Charles Southerland, Chris Kunstt, Christopher Kemsley, Colin Negrych, Deeptanshu Malik, Eric Eccleston, Israel Scott Grogin, Jeremy Shimanek, John Krawiec, Justin Fritz, Kavon Johnson, Kevin B, Marcos Silveira, MdeG, Michael Shebanow, Nunya Beezwax, Philip Rice, Rob Neal, Scott Dreblow, Tracy Karin Prell, and Umar Khan.
Many thanks go out to @LaunchPadAstronomy ! Liliana and Kimberly attended the annual Launchpad Astronomy Workshop for writers, led by astronomy professors Mike Brotherton and Christian Ready. Read more about our experience here:
✷ www.launchpadworkshop.org
✷ www.socratica.com/the-socrati...
Christian generously reviewed this script and offered advice. Be sure to check out his channel “Launchpad Astronomy” where your friendly neighborhood astronomer keeps you up to date on all the latest in the astro world.
✷ / christianready
✵✵✵✵✵ SUPPORT SOCRATICA
You can support our channel by making purchases using our affiliate links. These are books and other resources we have used ourselves, and can personally recommend. A small percent of your purchase (usually 1-2%) will be shared with Socratica by the vendor.
We highly recommend the Astronomy textbook “Universe” by Roger Freedman et al:
✷ 9th Edition amzn.to/2so6Ums
✷ 10th Edition amzn.to/2tfBjUe
✷ 11th Edition amzn.to/3mhxqvv
Moon Globe with explorations
✷ amzn.to/3me3kZM
Celestron 6-inch computerized telescope
✷ amzn.to/3mhdysk
Our STUDY TIPS BOOK is now available!
How To Be a Great Student
✷ e-book: amzn.to/2Lh3XSP
✷ Paperback: amzn.to/3t5jeH3
Or read for free when you sign up for Kindle Unlimited:
✷ amzn.to/3atr8TJ
Shop Amazon Used Textbooks - Save up to 90%
✷ amzn.to/2pllk4B
✵✵✵✵✵ MORE WAYS TO SUPPORT SOCRATICA
JOIN this channel for cute owl badges:
✷ bit.ly/SocraticaBadges
SUBSCRIBE to Socratica:
✷ bit.ly/SocraticaSubscribe
SUPPORT Socratica on Patreon:
✷ / socratica
DONATE with Paypal:
✷ www.paypal.me/socratica
GIFT CRYPTO with Bitcoin:
✷ Our address is bc1qda47tgfyk67lxa7yqn8y5m02hjcglghsd5c58n
✵✵✵✵✵ CREDITS
Presented by Liliana De Castro
Written by Kimberly Hatch Harrison
Produced by Kimberly Hatch Harrison & Michael Harrison
Picture Credits
ESA/Hubble & NASA Proxima Centauri from Hubble Space Telescope
www.nasa.gov/sites/default/fi...
Orion Nebula - Spitzer Space Telescope
images-assets.nasa.gov/image/...
NGC 6717
Globular star cluster from Hubble Space Telescope
ESA/Hubble and NASA, A. Sarajedini
Meditations F8LKFUP3ZHZBPIZR
Keeping On SMGDBQIF83RWQWEQ
#Astronomy #LightYear #Parsec
There's a Challenge Problem at the end so you can test your understanding. Give it a try!
You can check your work on our website: www.socratica.com/lesson/astronomical-distances-problems
🌻🧚♀️😉
Great video. I'm interested in astronomy, but did not ever look up how a Parsec is defined, so, thanks for teaching me this!
We were so delighted when we first read about parsecs in a book by Isaac Asimov!
@@Socratica Wow, Isaac Asimov👍
a suggestion for you to return with the series "back to school with the Socratic" in Portuguese. I love this series. just like all the others...
abraços do Brasil... 😄
gente, eu AMO essa atriz! ela continua incrível ❤️
Lili é maravilhosa msm
This channel is one of the best !! Really fabulous video..
I really love astronomy and science so much and my interest went more deep as I explore your channel..!
I never knew what is parsec but today I came across and learnt a new word from you!thanks a lot for this amazing videos..it's really helpful!!
Loved your channel, and subscribed too!!
One of the best channels! Thank you for the videos!
Thank you for your kind message! We're so glad you're watching. 💜🦉
Thanks a lot for providing this awesome content! ✌️
Thank you for making such great videos! This was really informative :D
We're so happy to be making more astronomy videos! Thanks for watching! 💜🦉
That was new, and interesting.
Love the way you make us understand 😍
Please more astro videos 🥰 love it so much.
always Fascinating
Excelente! ❤️
Thanks for the videos! Do one on the Akkadese Maelstrom? 🤖
Great as always. Any chance we get updates on Socratica BR ?
For me, light time would be the easiest and most logical way to measure ALL distances in space, from galaxies that are billions of light years away, to the sun, which is around 8 light _minutes_ away.
Agreed!
You are really nice and doing it well
Super interesting! :)
I need a teacher like you in my college !
U makes hard things easy . Thank you mam
Very nice video, because this explains the concept of parallax from the very, very beginning. This is what I like.
On a sidenote - if you want to write a sci fi story about a very uptight / correct / lawful scientist or something, he could say things like "we need to cross the distance of 4.503 parallax arc-seconds" or so. Would give this dude some colour, some old fashioned colour, if you know what I mean.
Some retrofuturistics.
"Retrofuturistics" is such a beautiful concept!
I was already missing to see Lili performing. ❤
Hey @Socratica, I love you're vids and I am interested in buying your book about being a great student. However, the book is not (yet?) available in Italy.
Will it be available some day?
How kind of you to ask about our book! We'll investigate. Grazie!! 💜🦉
This is so cool
Can you make a video about HX group, fuzzy set and hyper fuzzy, please ❤
I speak fluent spanish and portuguese, but i speak very little english as i wish the socratic portuguese would come back liliana. ps: please come back. I really admire the work of the Socratic team.
I learned something new today
Yeah the "Kisell run in 12 Parsecs" to me was just a script writer confusing the definition of a Parsec. I believe the sentence requires a unit of time, not distance.
In "Solo", it was explained that it was the shortest distance in which anybody had been able to complete the "run", using a more dangerous path.
We thought that was a clever solution to this embarrassing problem, heehee!
@@Socratica The only problem is really what they mean by "parsec" in a galaxy far, far away, since it's an Earth-centric unit of distance. They should have stuck with "light-year".
Tell us about the Kessel run.
I would do the Kessel Run in 10 parsecs just to see a video from Liliana!
AU was historically important because before the astronomers were able to measure the AU, they had to deal with relative distances within the solar systems. These relative distances were much easier to measure than to relate them to the distances on the earth. So for a while they worked with AU and doing precise measurements and calculations not knowing it’s value in other units all that well. Same goes for the parsec.
30 AU to Neptune.
276,264 AU to the nearest star.
The transition to using LY (4.37 LY to the nearest star) seems all the more necessary.
But we get back to using incomprehensible millions and even billions, even using LY or PC as our unit of distance, on the scale of the observable universe.
Even our "local group" of galaxies is 10,000,000 LY or 3,000,000 PC across, which is about 100 times the diameter of our own galaxy, the Milky Way.
I'm a little off topic but can u do a video on how to become interested in science. I do feel excited when I read sth related to it but I don't actually remember to open news and stuff to read regularly. thanks in advance.
This would fit in well in our "Study Tips" series!
Please, come back to Sobratica in Portuguese.
5:08 - a very interesting effect. ☺
She has bitcoins? 👀
Bella científica
I'm not that interested in this subject but the way you present it.. oh my 💕
Keep uploading please.
When do we get more Abstract Algebra lessons?
I am waiting for information about Kessel Run...
Que saudades do Socratica Portugues!
Muito triste isso :( eu gostava bastante. Mas não tem nem se quer uma legenda em português disponível
Heh. The video didn’t say it, but 1 light year is 63,241.1 AU.
Proxmia Centauri is 268,770 AU away.
We’re stuck guys. May as well have been born in that rogue stellar system from Iain M. Banks’s ‘Against A Dark Background’
That's all nice, but when will she introduce us to the expert?
I come from a planet 41.7 Parsecs from your Earth. We use folding space for travel, as demonstrated on Star Trek Voyager.
The gaia mission (ESA) can measure parallaxes up to tens of micro-arcseconds. However, the conversion from parallaxes to distances is not as simple as 1/p due to the errors. It requires a more complex statistical analysis.
Ooooooo! Thanks for sharing.
I didn't know you needed to know about parsecs unless you were watching Star Trek.
Damn apart from light year, never heard of the other two.
We're so glad you're learning more astronomy with us! 💜🦉
What about this definition:
A parsec is a distance that sees the average Sun-Earth distance under 1 arc-second.
That should be a half arc-second.
Why? Because we're talking about the /diameter/ of Earths path, not its radius.
@@georgwrede7715 Nope.
A parsec is calculated using a triangle with apex angle of 1" and base of 1AU (radius of the Earth's orbit around the Sun.)
And The average Sun-Earth distance is the radius of the orbit. Definition sound to hold.
Agradabilissimo vela aqui e nao em uma novela ( rsrsrs) apesar de ser uma otima atriz de novela.
My 4yo nephew likes to watch Socratica Kids channel. That would be interesting to show there.
Oh gosh, we'd love it if you'd share our videos with your nephew. It's so important to encourage curiosity for kids!
The other good news is that we recently started the Socratica Foundation, which will fund more content for Socratica Kids. Stay tuned!
I wonder how it feels to travel in lightspeed?
Triste ver que o canal em português não cresce tanto
Luna ❤
side note - she skipped saying "Uranus". I giggled.
If youre racing someone.... from the same point, to the same destination.... but your race isnt through space, but through time instead; i.e. a temporal destination.... then it makes sense youd be competing for shortest distance, rather than for shortest time, as you normally would in a race through normal space. Proof star wars has time travel.
There are more cubic light-years of space in the observable universe than there are H2O molecules in an olympic swimming pool :0
and a single drop of that water would have more molecules than there are grains of sand on Earth.
So you heard about the Millennium Falcon...
Seria tão útil esse vídeo em português
🌻🧚♀️😉
wait what, ... let me look at this again
1:56 PARSEC
what is 1 shake ???????
1. The term AU (Astronomical Unit) is quite vague and unintuitive. There should be a better name for such a unit. Because it is the average distance between the sun and the Earth we could call it SED (Sun-Earth Distance).
2. Even parsec is not an appropriate unit of distance when talking for example about the distance between galaxies or the size of the observable universe. Light-year is still preferable to parsec, because light-year not only refers to the distance but the time it takes for light to travel that distance.
Inside the Milky-Way Galaxy we could use the distance between the sun and the center of the galaxy as an unit. Let's call this unit COW! Or MOO! If you can have an unit called AU, why not have have one called MOO?
Rather, the question should be why long time ago in a galaxy far, far away, they measured distances the human way, wrongly.
I thought Parsecs only existed in Star Wars…Mind blown !
We were so happy when we learned what they were!! 💜🦉
@@Socratica I took astronomy this year and I’m doing the second part this spring! I’m so excited I thought this course would be hard to understand NOPE it’s easy and fun!
It sounds like the universe is a really big place, and I guess it's expanding ever faster into the nothingness.
Namaste madam
149 Million kilometers ? you mean 0.149 Terameters ?
if we can do it with bytes, why not ?
Do nada o yt me recomenda isso
S2
Socratica Português
morreu de vez? ):
Triste, não tem nem uma legenda em português
@@micaelavital1644 Eles realmente poderia pelo menos colocar legenda em português. ):
I am back
YOU are breathtaking!
Heehee
"She's the fastest hunk of junk in the galaxy."
Volta com o português POR FAVOR
How far to Burger King 🤴
1:28 it would take you 78 billion years to reach Alpha Centauri from our solar system if you somehow could drive a car at constant 100km/h speed...
🤣🤣🤣😂😂
1st comment 😍
1st thank you for watching! 💜🦉
@@Socratica 😍
do americans know what a kilometer is?
Those of us who work in the sciences do, for sure! But it seems like a lot of industries have the old British Imperial/US Customary system entrenched and it's going to take a miracle to switch over. Maybe one day.
Another bit of science that flat Earthers don't understand, and so as usual: straight out deny.
Parsecs 😠
Call upon the LORD JESUS today!!! ....there is no hope elsewhere. Today is the day of salvation. ONLY JESUS SAVES. 1Corinthians 15 1-4 is the gospel of salvation. Put your faith and trust in Him, NOT in man....satan is the god of this world for now....but....JESUS is coming. Make sure you know Him, and that He knows you!
Sorry unsubing every channel until the dislike button works again. No dislike? No like!