How Do Telescopes Work? | Earth Science

Рет қаралды 305,279

Күн бұрын

Greg Foot explains the inner workings of a telescope. Science has come a long way since the first two lens prototype invented back in 1608.
Subscribe for more awesome science: bit.ly/SubscribeToEarthLab
1 www.space.com/21950-who-invent...
2 astro.uchicago.edu/vtour/insid...
3 www.gtc.iac.es/gtc/gtc.php
4 www.space.com/22505-worlds-lar...
5 www.nasa.gov/mission_pages/hu...
6 www.spitzer.caltech.edu/mission
7 kepler.nasa.gov/Mission/faq/#a4
Welcome to BBC Earth Science! We answer all your curious questions about science in the world around you. If you have a question let us know in the comments on any of our videos and it could be answered by one of our Earth Science experts.

Пікірлер: 222

@hoehoehoe4559 6 жыл бұрын

*bigger is not always better* *(THANK GOD)*

@broilypee2244 4 жыл бұрын

i understand what you mean

@carljohnsoncj6896 4 жыл бұрын

Bootahdah The 1st no u don’t

@Sodhi.jaspreet 4 жыл бұрын

Not in all cases

@yoyomodiji 4 жыл бұрын

@@Sodhi.jaspreet aur sardar jii kaise ho

@arielatomhc 3 жыл бұрын

This is called a Adult Joke.

@jm08a31 7 жыл бұрын

Greg: "Get rid of the atmosphere" Me: "OK!" **pauses video and gets rid of earth's atmosphere**

@ivantrtanj7 6 жыл бұрын

Hyper I bet u forgot about this bad bad joke

@josiahtownsend6863 3 жыл бұрын

Ivan my friend

@RustyKeys72 7 жыл бұрын

The Fantastically Accurate Reflector Telescope... It's FART, right?

@oomegalinux 7 жыл бұрын

Yup! I work in an observatory so I plan to write down the acronym on the meeting room whiteboard to see how people react :D

@ZippyDoodah 6 жыл бұрын

@snoopah3077 3 жыл бұрын

FATR = Fantastically Accurate TelRad

@Astromorph1337 4 жыл бұрын

"looks into the sun with a 30 meter telescope''

@valentina3300 4 жыл бұрын

😂.. with a 30m reflector telescope"

@gabriellebibalou4569 2 жыл бұрын

This video was really helpful!! Thank you so much for explaining it clearly :)

@balvirghik6057 5 жыл бұрын

Really fantastic explanation. Information kept simple and presented as good as it gets.

@adityapande412 7 жыл бұрын

These guys deserve waaaaay more subscribers. They offer one of the most satisfying content!!

@GregFoot 7 жыл бұрын

Why thank you very much :-D

@harrydibden3365 Жыл бұрын

1.2 million enough?

@EMEDITZZZ 8 ай бұрын

@@harrydibden3365the comment was 6 yrs ago so the channel would have been much smaller

@Ajodee3666 4 жыл бұрын

This video helped me in my school project

@GerHanssen 7 жыл бұрын

Lippershey's telescope actually had a negative lens as an ocular, just like Huygens and Galileo by the way. But for purposes of clarity I can understand this choice of explanation. Very well done!

@TheJcb630 7 жыл бұрын

Wow, by far one of your best videos, fantastic detail.

@GregFoot 7 жыл бұрын

THANKS! :-D

@notme1998 6 жыл бұрын

Very helpful video!

@CaspersSVT 4 жыл бұрын

Good Video and Easy To Understand. Thanks and Cheers!

@hoemuffin 7 жыл бұрын

We moved away from refractors not because of light absorption, but because of Chromatic aberration - even with achromats, as aperture increases in size, focal ratio needs to grow much faster in order to offset chromatic aberration. The two lenses are unable to bring all the colors into focus. It wasn't until the creation of apochromats with their ED/Flourite elements that refractors - but those don't work on large scales because it is prohibitively expensive. There is also the issue that very large lenses are very thick, very hard to make. Once you get past a certain point, the glass will just bend and flex due to its own mass, which of course ruins the image. Reflectors have the same issue, but they are at least supported on one end. We've also solved it using segmented mirrors and fancy engineering tricks. The creation of adaptive optics allow us to get very clear, distortion free views of space at a fraction of the cost of a space telescope.

@thescienceguyprof.juncajig2749 3 жыл бұрын

Very informative, Thanks for this video

@atomicx3668 4 жыл бұрын

Anyone from online school?

@blaze1029 3 жыл бұрын

yep

@michaeluwuowo 3 жыл бұрын

yea

@sanjitsrinivasan8825 3 жыл бұрын

yep

@anirudh964 3 жыл бұрын

Yep😎

@iris3804 3 жыл бұрын

im here from real life school

@khoopinyuan5897 3 жыл бұрын

Thanks for your explain

@James-wl4wi 7 жыл бұрын

wow last time i was this early this channel didn't exist

@Throwaway_4928 2 жыл бұрын

Omg thanks! My science exams is about space and telescopes. At first I didn’t understand a thing, but after watching this, I do now, TYSM!

@DavidHallett 7 жыл бұрын

Perhaps a video on radio telescopes, including the plans and status of the Square Kilometre Array (SKA) project?

@bojant1364 7 жыл бұрын

Love it how this channel explains everything in such depth and understandable for everyone! :)

@GregFoot 7 жыл бұрын

Cheers Bojan!

@emmanicholson36 5 жыл бұрын

great video it really explained the telly

@konar1142 Жыл бұрын

Straight to the point

@ghanshyamkumar5888 4 жыл бұрын

Thankyou very nice video

@KarlFFF 7 жыл бұрын

Yay Greg! missed your videos :)

@GregFoot 7 жыл бұрын

Cheers Karl! :-D

@xcalibur6482 5 жыл бұрын

Can we use the gravitational lensing of a black hole for the same purpose.

@jr52990 7 жыл бұрын

Wait a second. A glass lense that's 1m in diameter that weighs 26 tons? ....Or did you mean that the whole telescope is 26 tons?

@CanadianOptionsTrader 7 жыл бұрын

I estimate about 1000 kg or less, using a density of 2.51 g/cm3.

@jr52990 7 жыл бұрын

That's what I was thinking. 26 tons sounded waaay too much for a lense with a diameter of 1m. I mean, unless the depth of the lense was at a magnitude of meters.

@jakescott5679 7 жыл бұрын

Yay Greg is back

@GregFoot 7 жыл бұрын

Helllloooooooooooo I'm baaaaaaaack! :-D

@sanlitun6549 4 жыл бұрын

good video

@chrismastere 7 жыл бұрын

The Outlook notifaction sound at 4:11 made me check my email.

@GregFoot 7 жыл бұрын

hahaha well heard!!

@shadow404atl 7 жыл бұрын

Wow, you didn't even mention the upcoming JWST?

@vikassinghmaurya2101 2 жыл бұрын

Please also explain James webb telescope. And thanks to explains each and everything in details. 😊😊😊

@Joeobrown1 7 жыл бұрын

best video on this channel in ages

@GregFoot 7 жыл бұрын

cheers Joe glad you enjoyed it!

@ronaldwhite1730 2 жыл бұрын

Thank - you .

@prawtism 7 жыл бұрын

Is there a blind spot in the centre of the mirror telescope? Or is the mirror that reflects into the eyepiece one-way?

@santiagomoebio 2 жыл бұрын

I haven't seen yet a good explanation of why objects are augmented through a telescope. In fact, the focal length of objective versus focal length of eyepiece appears to reduce the size of the object (by same proportion)!

@silvadexter3222 6 жыл бұрын

Love ya my dude

@tncreations1267 Жыл бұрын

fantastically useful crazy keplar telescope

@MsAlexisPiazza 7 жыл бұрын

Ha ha! Fantastically accurate reflector telescope

@onetwothreefour3957 2 жыл бұрын

good video, but why dont we see a dark spot in reflection telescopes where the little inner mirror is?

@aryanporwal5066 6 жыл бұрын

Awesome

@davidalex8403 7 жыл бұрын

Just a thought but you guys should give images of the examples you're talking about

@sachinkumar064 2 жыл бұрын

Absolutely brilliant video. Great explanation.

@MightBeArxbird 2 жыл бұрын

came into this video not knowing how telescopes work. leaving this video knowing how telescops work. thank you bbc :)

@Thesimarpal1 3 жыл бұрын

What is your view on James Webb Space Telescope. Can you make a video on it ?

@capitaopacoca8454 3 жыл бұрын

Thanks

@martelmichaels3511 3 жыл бұрын

Great video I’m expert now !🤓

@galibjaman 5 жыл бұрын

What a simple explanation! In my text its explained like a FUKn rocket science.

@maxre3723 5 жыл бұрын

i need to watch this for homeschooling work XD

@movienaut 3 жыл бұрын

Are telescope with concave mirror better than those with convex lins?

@boogalythegreat9854 3 жыл бұрын

Question: Why Doesn't the secondary mirror in reflector telescopes create a black spot in the middle of the image?

@ColinJonesPonder 7 жыл бұрын

Fantastically Accurate Reflector Telescope =3 😂

@michaelggriffiths 7 жыл бұрын

The BBC reasearched this subject in depth when they designed their TV Detector vans..

@jeanlukvolker5130 6 жыл бұрын

How about this the 90 reflector telescope. For the future terrestrial planet finder which was supposed to be launched back in 2009 however the plans to launch the telescope has been postponed twice

@nathan34733 4 жыл бұрын

I am happy that telescopes exist

@kungfusing1 6 жыл бұрын

Not sure about 2:14 but nice video

@subhasrijs2309 2 жыл бұрын

There are some errors in the ray diagram of the refracting telescope, kindly do go through it.

@brasildocara 6 жыл бұрын

¡¡explain how works the focus!!! please

@philippereekie9625 7 ай бұрын

I bet flat earthers loved your comment about seeing a firefly in Tokyo from NYC 😁

@krabkit 7 жыл бұрын

what about the Arecibo Radio Telescope 305 meters across(1000 ft) surely that qualifies as large

@fuckednegativemind 7 жыл бұрын

Not an optical telescope. But yes, it's one of the biggest all categories telescope with the FAST (500 meters diameter). But if we count the interferometers, well, there's no limit except the size of the Earth!

@ani4787 3 жыл бұрын

Fantastically Accurate Reflector Telescope (FART) 😂😂😂

@athenaenergyshine7616 6 жыл бұрын

Hi, I love this video. i understand more about telescope than before. I do have some questions though. does reflector telescope also uses lense?

@malwre_android1617 4 жыл бұрын

No; refractors use lenses, while reflectors use mirrors. Catadioptric telescopes, however, use both mirrors and lenses

@malwre_android1617 4 жыл бұрын

(the ocular is a lens that exists in both, however, so there technically is a lens in the relflector telescope, but the image is generated primarily by mirrors)

@valentina3300 4 жыл бұрын

@@malwre_android1617 could you please recommend me some good telescope up to €150. I am beginner. Thank you.

@valentina3300 4 жыл бұрын

@@malwre_android1617 also, what is better, refractor or reflector?

@malwre_android1617 4 жыл бұрын

@@valentina3300 I'm sorry, I'm not a telescope enthusiast, so I couldn't recommend a specific telescope brand or model :/ I just know based on a project I made. I will say, however, that reflectors are generally better because they capture the entirety of light emited by objects (because they work by reflection instead of refraction, and if the lens is smudged or damaged, it could severely harm the quality of the image) and because some refractor telescope lenses, if configured incorrectly, could lead to chromatic aberration (when the colors on an image are highlighted at the edges, like a 3D effect, in a way)

@VaskoGame 7 жыл бұрын

I always thought that stars twinkled because of their wobble? Maybe a combination of both atmospheric distortion and their wobble??

@YohamaMr 3 жыл бұрын

you The Telescope Man !

@MauroTamm 7 жыл бұрын

Yes there is enough light bouncing off those objects - it just scatters so much over distance, very little - if any reaches our eyes.

@GregFoot 7 жыл бұрын

that is a good point!

@EcuaKillaclan 5 ай бұрын

I impulsively bought a 500 telescope, when I opened it, I was very disappointed to find out it wasn’t a camera, 😂😂😂 then I came here to find out how a telescope actually works. I’m still enjoying my telescope as much as I thought I was going to. It was just a humbling moment realizing telescopes are not actual cameras xD

@ananteolas 6 жыл бұрын

Can you use telescope for mocroscope

@katelynnmaclin1278 4 жыл бұрын

Good

@katelynnmaclin1278 4 жыл бұрын

Wow

@alanayserter9877 7 жыл бұрын

I remember my teachers saying years ago saying that it is impossible to bend light. I knew they were wrong :D

@giovannip8600 5 жыл бұрын

3:36 wouldn't the mirror in the middle ruin the image? Help

@redmatter1075 Жыл бұрын

And now we have the James Webb Space Telescope 5 years later

@uncensored6925 3 жыл бұрын

Someone just summarise this for me Online school is a pain

@bilalsaleem7265 2 жыл бұрын

Surprised that you didn’t mention anything about James webb telescope

@imarcusjjuanm5333 7 жыл бұрын

Wibbly wobbly?... timey wimey?😂

@sbomorse 7 жыл бұрын

iMarcusJ JuanM exactly what came in to my head!

@ghagen5552 4 жыл бұрын

hahaha doctor who joke

@mahabaleshwarrudramuni6616 2 жыл бұрын

You forgot to mention the Radio Telescopes !!

@adarshwankhade9201 3 жыл бұрын

So now that i know how it works, can I make one?

@AbdrahmanHaouti 2 жыл бұрын

Webb’s Telescope first images brought us here

@Riku16994 7 жыл бұрын

seeing tokyo from new york, towards east?

@stal2496 4 жыл бұрын

Wibbly wobbly

@gabrielestephan105 3 жыл бұрын

its 12;30 am here

@IpadKinect 7 жыл бұрын

What are the numbers in the top left for?

@Wh3atley 7 жыл бұрын

References to the sources used. Their bibliography is in the video description

@LindsayDaly 7 жыл бұрын

They're for the citations - all the articles they've sourced from are in the description below!

@IpadKinect 7 жыл бұрын

Ahh thank you!

@harshsarada9220 3 жыл бұрын

Can light can come to telescope from 1 light year distance to see that object

@jaridkeen123 7 жыл бұрын

that face at 0:00 lmao

@chillout1109 6 жыл бұрын

I thought Five hundred meter Aperture Spherical Telescope (FAST) was the largest telescope?

@mitchellspeirs7097 3 жыл бұрын

1:33

@southernexposure123 6 жыл бұрын

How does a telescope convert invisible light and other light frequencies to visible light?

@mrsqueaksqueak8686 6 жыл бұрын

southernexposure123 "How does a telescope convert invisible light and other light frequencies to visible light?" - It doesn't really. The camera attached to the telescope does. CCDs used in telescopes have a much wider spectral response than the eye, from the invisible infrared to th invisible ultraviolet. The output of a ccd is electrical and can be assigned visible colours. Furthermore, the CCD can be used for extended light capture, revealing details that cannot be seen by a human-eye using theexact-same telescope.

@southernexposure123 6 жыл бұрын

OK Thanks I listened again to where he mentioned the Spitzer telescope where said the telescope was attached "with" such a device like you mentioned whose sensor is designed for detecting invisible things. I must have gotten distracted about the time he said that the first time I watched. Thanks again.

@RolandBanc 7 жыл бұрын

Nice video, but to be honest, I am not really satisfied with some of the explanations. Firstly the magnification of the telescope can not be understood by what you've said. The image does not look bigger, because the the object seems to be at front of your eyes. If this would be the case then stars shoul also be bigger, but they are also point-like trough telescope. The real answer comes if you sent other parellel lights trough the telescope. In this case you should observe that the angle, the lights comes into the objective is sometimes greater at the ocular. This magnification of the angles is the real deal. Furthermore, Newton-type telescopes are not primary good for the lack of reflected light on the objective. Mirrors ara much easier to produce, much lighter, and they does't have the effect of cromatic distortion.

@rishisund3133 7 жыл бұрын

what is the atom symbol in the corner mean?

@GregFoot 7 жыл бұрын

footnotes - see video description for sources :)

@mitchellspeirs7097 3 жыл бұрын

1:34

@projectcarz4798 3 жыл бұрын

0:25

@CondensedComments 6 жыл бұрын

3:34 Wouldn't a reflector telescope produce a small blank spot in the center due to the piece that redirects the image to the eye? Even if you catch it at it's most smallest concentration of light there would still be a idea sized blank spot. I guess you could shift and compile multiple images to adjust for that?

@darknite-vu7sm 5 жыл бұрын

The Creator it would seem to be the case i own one it has no blind spot still not sure how it gets around this.

@IpremiumSsarcasmi 6 ай бұрын

Now we have James Web🎉

@boomerwithatumor4624 2 жыл бұрын

So if the telescope is deployed into space to prevent atmosphere distortion, and these things are taking images millions of light years away , how doesn't the signal get disrupted by any planets /objects in that line of sight ?