Brilliant explanation of using Fourier transforms , is of course is " Aperture synthesis". Developed by Joseph Fourier at the time of Napoleon is one of the most useful tool to understand reality.
this is amazing.... I must sound like a broken record because I am repeating this in almost every video but things shown to me on this channel are simply AMAZING!!
Once again I'm compelled to thank you for making these videos, Brady! I love to listen to research scientists speak about their fields of study when the audience is just a curious subset of the public at large. Bonuses in this video included a conversation with a handsome alpaca and my new favorite word: 'anti-breadloaf'.
Excellent explanation of Fourier’s Transform being outdoors 5,000 m high. However, the plot shown (Power vs time) 13:15 is raw data and not a frequency spectrum (Power vs freq.) which should be the Fourier transform of such time waveform, calculated by the Correlator through an algorithm called Fast Fourier Transform, useful for scientific purposes, as said.
Quick question, at 5:55 three "rows" of dishes can be seen, all built a bit different. Could you elaborate on those differences or is it simply due to the diameter of the dishes? Thank you for all the videos and great insight.
Now, this is my kind of mega construction! I recently found out about LOFAR. It's the largest radio telescope in the world and it's based in Europe. It has one station in southern England and it's "core" is based in The Netherlands. Have you ever thought about visiting LOFAR, Brady? I'd love to see some footage of the arrays from you. Plus, it's a lot closer to home ;).
that is some of the most impressive use of science and engineering I have seen. what and who are people fighting wars for ? lets work together and head off to the stars to ensure a future for humanity.
I always feel like I'm looking at what Mars will be like when I see these videos. Such a stark desolate landscape with really amazing structures and technology.
What's with the different "models" of the antenna? Some look different to each other. Do some specialize in more short range while some specialize in more long range?
Fantastic - pls turn your cam not so fast ... Could you recommend literature regarding the interferometer and the method of getting a picture for non-specialists...?
The view looking out past the snow to the array of telescopes looked surreal. It looked like you were on some extraterrestrial basestation. Another super cool video! Thanks.
amazing stuff here. I imagine that when he said they are limited by the dish size he is talking about a moving one? (hint hint - when are you doing one on Arecibo?) and a second question - other radio telescopes usually do not need such high altitudes, I guess this one does due to the wave length it it designed to receive?
Any chance you'll be visiting the various facilities which are being used to develop technologies for the Square Kilometre Array? I'm interested in hearing about the low-frequency ones like LOFAR in The Netherlands and the Murchison Widefield Array in Western Australia.
If it is possible to combine images from many large telescopes, why not use a huge number of small ones in array? Are there any technical disadvantages to use many cheaper units?
ako You need even more computing power to combine the data. A large part is also knowing exactly how the telescopes are positioned compared to eachother. Plus a larger surface area means you can take the same image in less time. I'm not an expert though. These are just the things that I think are true based on the mathematics they are using. Especially the positioning is extremely important. There's a good reason why the guy emphasized the engineering challenges for the pads.
Alex Fielder Well, this particular paragraph was cited from a book named Wonders of Llamas by Roger Perry, page 7. I guess if they ran away you might find them in the wild. Dingos used to be domesticated too.
I know it's not exactly a science issue per se, but I'd love to see a video on how you finance a project like this!! It's absolutely remarkable what they were able to build here :)
I notice there seems to be two different types of support structures for the secondary "mirror"/reflector - is there any reason why they're different or is it just a case of "because they are"? Thanks for another great video Brady/DSV!
6:40 Okay, that is not completely clear. What is the main hurdle of building a single very large telescope? 1. Is it not physically possible? (or at least believed to be) 2. Is it not possible with current technology? 3. Is it too expensive with current technology?
+JuanLeTwnz You can build antennas larger than the 100 meters - but they are build into the ground and cannot move - so they look in the same direction.
There's always the risk of high altitude pulmonary edema and high altitude cerebral edema at altitudes~ >3000m (I think it's 3k, but maybe 2k - in that ballpark). It doesn't matter how fit a person is, either. I'm sure they were instructed to alert someone at the facility and to start breathing from the O2 tank & descend immediately if they couldn't catch their breath or experienced a bad headache, fever, or just started feeling worse.
Oops! You meant long-term! I think if someone suffers and survives high-altitude cerebral edema, their brain can continue bleeding after they return to normal altitudes.
AeroDoe With the speed on the road plus the fact that you are required to stop at the main center which is less than 3,000 meters, it is not an issue at all. My first trip I barely even noticed at the base, it did not become an issue until we passed 4250 mark as we went up towards to highest altitude antennae. Admittedly, I normally live above 2450 meters in height, so it was a wee bit easier for me.
Ivan Petrosevic , yes ALMA just opened for public visits earlier this year. See more www.almaobservatory.org/en/press-room/announcements-events/816-alma-opens-for-public-visits.
Brilliant explanation of using Fourier transforms , is of course is " Aperture synthesis". Developed by Joseph Fourier at the time of Napoleon is one of the most useful tool to understand reality.
this is amazing.... I must sound like a broken record because I am repeating this in almost every video but things shown to me on this channel are simply AMAZING!!
***** that's okay - that is the kind of broken record we like!
+DeepSkyVideos All your channels are amazing......amazing......amazing......amazing......
maybe you're just a bot that writes "this is amazing" on every single video on youtube :P
Why u spam? D:
Once again I'm compelled to thank you for making these videos, Brady! I love to listen to research scientists speak about their fields of study when the audience is just a curious subset of the public at large. Bonuses in this video included a conversation with a handsome alpaca and my new favorite word: 'anti-breadloaf'.
kkira22 we appreciate your comment
Couldn't possibly have found a better guide, this guy knows his shit on all aspects.
I can't believe how quiet those antennae are when they move.
ALMA is by far one of the craziest (meta) machines I've ever seen.Thank you for showing this.
I like the term "anti-breadloaf".
That would be a "bread pan".
@@christopherschrader3067 this is extra funny for hispanics because "pan" literally means "bread" in spanish
Brady, you have a dust spec on camera sensor @ 12:05 o'clock. Check at 1:29.
That was super awesome. So glad that this kindve thing gets funding.
i'm always amazed at how much the Atacama desert resembles my imaginary Mars, i hope i'll be able to go there some day
G's those things can move a hell of a lot faster than one would expect
Teddy Boragina I know!!!!
Did Pete do the pretty night pictures/time-laps-video?
Excellent explanation of Fourier’s Transform being outdoors 5,000 m high. However, the plot shown (Power vs time) 13:15 is raw data and not a frequency spectrum (Power vs freq.) which should be the Fourier transform of such time waveform, calculated by the Correlator through an algorithm called Fast Fourier Transform, useful for scientific purposes, as said.
Best video ever. Never got a proper explanation before. Now I finally understand.
Really liked the humor on this one (also the telescopes were pretty cool obviously)
The awesomeness is unquantifiable.
Quick question, at 5:55 three "rows" of dishes can be seen, all built a bit different.
Could you elaborate on those differences or is it simply due to the diameter of the dishes?
Thank you for all the videos and great insight.
Brady, I bet the Fourier analysis they conduct would make an awesome numberphile or even computerphile video.
Now, this is my kind of mega construction!
I recently found out about LOFAR. It's the largest radio telescope in the world and it's based in Europe. It has one station in southern England and it's "core" is based in The Netherlands.
Have you ever thought about visiting LOFAR, Brady? I'd love to see some footage of the arrays from you.
Plus, it's a lot closer to home ;).
that is some of the most impressive use of science and engineering I have seen.
what and who are people fighting wars for ? lets work together and head off to the stars to ensure a future for humanity.
Awesome. Although I feel short of breath just watching you guys.
Awesome Brady! Nice to see more DeepSkyVideos coming, this is by far my favourite channel on YT :)
The pattern of the telescope pads looks very mathematical.
Would make a greate numberphile video to talk to the people who placed them.
I always feel like I'm looking at what Mars will be like when I see these videos. Such a stark desolate landscape with really amazing structures and technology.
That was an amazing video Brady. Nice work!
10:45 You can really see the monstrous scale of these things.
Thank you so much for bringing me to a place I can not physically visit. What an amazing place.
Nice Sir .
Thank You Brady .
THANK YOU DENIS .
What's with the different "models" of the antenna? Some look different to each other. Do some specialize in more short range while some specialize in more long range?
Thanks, Brady! Looking forward to seeing Part 2.
Fantastic - pls turn your cam not so fast ...
Could you recommend literature regarding the interferometer and the method of getting a picture for non-specialists...?
I wonder how much one of those transporters costs. They're probably custom made even.
tjpld They are custom made, indeed: www.scheuerle.de/en/products/new-vehicles/special-transporters/antenna-transporter.html
The view looking out past the snow to the array of telescopes looked surreal. It looked like you were on some extraterrestrial basestation.
Another super cool video! Thanks.
Do cars need any special equipment or treatment to operate at those altitudes?
Fantastic Brady!!!
Awesome, thanks Brady
Absolutely amazing video. Late to the party, but happy I came!
amazing stuff here.
I imagine that when he said they are limited by the dish size he is talking about a moving one? (hint hint - when are you doing one on Arecibo?)
and a second question - other radio telescopes usually do not need such high altitudes, I guess this one does due to the wave length it it designed to receive?
A fascinating array of structures.
Awesome video! I didn't know that the antennas were actually moved around the place.
Brady, we should get some videos about Pluto for the flyby
Any chance you'll be visiting the various facilities which are being used to develop technologies for the Square Kilometre Array?
I'm interested in hearing about the low-frequency ones like LOFAR in The Netherlands and the Murchison Widefield Array in Western Australia.
This was really interesting! I had no idea about the amount of work and engineering that is required to keep things running. Really awesome!
could we build an even larger array in space someplace? with a radius of many km or even hundreds or thousands of km?
Thank you so much for posting this!! So cool to see this all in action. :)
Just got back from that area! Funny coincidence to think you may have been filming this the same time I was there.
Excellent video! Thank you for the tour.
Your camera work is great! What kind of camera is it?
Did you have to use your oxygen kit?
***** no, thankfully
Thanks for that. That was more interesting than their own clips for public:)
Is 02 pumped in to the buildings ?
If it is possible to combine images from many large telescopes, why not use a huge number of small ones in array?
Are there any technical disadvantages to use many cheaper units?
ako You need even more computing power to combine the data. A large part is also knowing exactly how the telescopes are positioned compared to eachother. Plus a larger surface area means you can take the same image in less time.
I'm not an expert though. These are just the things that I think are true based on the mathematics they are using. Especially the positioning is extremely important. There's a good reason why the guy emphasized the engineering challenges for the pads.
absolutely brilliant. Thanks
Can Nik do a review on the vixen polarie?
Amazing array
Great video. Thanks for that. Well done to film at that altitude. I've been to 4800m and I was flat out to drinking chai and sitting still.
Where can we see the result of this alms observation ? 🤔
This channel is full of awesomeness!
Could you please upload all your videos with the same audio level?
There is a lot of self-admiration of the blogger and very little astronomy itself.
So so cool! And breath taking scenery! (No pun intended)
More like L(L)AMA, am I right?
John Titor looks like a Guanako
Don't bully the llamas, they can identify as anything they want. Who're you to judge?
John Titor TIL Guanacos and vicuñas live in the wild, while alpacas - as well as llamas - exist only as domesticated animals. - wikipedia
Wikapeada lies! I did a report and some are not desmecated! :-P
Alex Fielder Well, this particular paragraph was cited from a book named Wonders of Llamas by Roger Perry, page 7. I guess if they ran away you might find them in the wild. Dingos used to be domesticated too.
Absolutly wonderful, thanks.
MerciaDragon you're welcome
What is the font that Brady uses in all of his videos?
Can normal people visit ALMA? I mean, people that are not working on it.
I know it's not exactly a science issue per se, but I'd love to see a video on how you finance a project like this!! It's absolutely remarkable what they were able to build here :)
Wow, what a landscape! and a technological wonder,
Enthralling! Thank you Brady, bless you!
Forget pyramids. This is a new wonder!
This is from your last trip to Chile or a new one?
Do the cars or the machinery they use to move the dishes around struggle at all to work because there's little oxygen?
I was not aware that the wavelengths being observed in radio astronomy were affected by atmosphere.
where is Dr. Arroway?
Love the reference to Lulu.
Very nice video! Thx for sharing!
Keep banging those rocks together people, you're doing a fine job.
I notice there seems to be two different types of support structures for the secondary "mirror"/reflector - is there any reason why they're different or is it just a case of "because they are"?
Thanks for another great video Brady/DSV!
Michael Gray This is an international effort. Different countries contribute the antennas. Let's just call it a multicultural telescope :)
I see, makes sense. Thanks!
These arrays are so cool :D
Absolutely amazing!
dat artsy nature shot doe
just awesome. Thanks.
Damn, these videos make me so proud to live close to there
6:40 Okay, that is not completely clear. What is the main hurdle of building a single very large telescope?
1. Is it not physically possible? (or at least believed to be)
2. Is it not possible with current technology?
3. Is it too expensive with current technology?
Probably 2 and 3
+JuanLeTwnz You can build antennas larger than the 100 meters - but they are build into the ground and cannot move - so they look in the same direction.
Are there any long term health effects when being that high (huehue) for longer periods of time?
There's always the risk of high altitude pulmonary edema and high altitude cerebral edema at altitudes~ >3000m (I think it's 3k, but maybe 2k - in that ballpark). It doesn't matter how fit a person is, either. I'm sure they were instructed to alert someone at the facility and to start breathing from the O2 tank & descend immediately if they couldn't catch their breath or experienced a bad headache, fever, or just started feeling worse.
Oops! You meant long-term! I think if someone suffers and survives high-altitude cerebral edema, their brain can continue bleeding after they return to normal altitudes.
AeroDoe ok, thanks for an informative respond!
The transporters are so very cool. They look like have just rolled out of a pod dropped from Thunderbird 2 :)
what's the difference between ALMA and E-ELT?
+Christian Alsing the frequencies they look at.
You guys ascended all in one day? Did they give you acetazolamide beforehand?
AeroDoe With the speed on the road plus the fact that you are required to stop at the main center which is less than 3,000 meters, it is not an issue at all. My first trip I barely even noticed at the base, it did not become an issue until we passed 4250 mark as we went up towards to highest altitude antennae. Admittedly, I normally live above 2450 meters in height, so it was a wee bit easier for me.
Is this place opened to public?
You know, for tourist visit?
Just asking :)
Ivan Petrosevic ,
yes ALMA just opened for public visits earlier this year.
See more www.almaobservatory.org/en/press-room/announcements-events/816-alma-opens-for-public-visits.
2:33 Hypoxia kickin' in real hard :-D
Nerdgasems all around! This is great technology!!
this is awesome ! Great video, it look like science fiction, so cool !
Those antennas move QUICK!
Wow, this looks so awesome! :D
ALMA Rocks!
That's so cool!
Cool video, great stuff thanks for sharing this, mind boggling but I don't mind.
2:33 to 2:40
I would work there if I could, but my tolerance to high altitude is not good enough to even work in the base camp.
That is seriously cool, I'd love to go there. Much wow, very jealous.
YAAAY SIENCE..... where is my jetpack? :D