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Video suggestions? (Patreon)

Published:
2019-04-10 13:52:45
Edited:
2019-04-10 14:06:17
Imported:
2019-04

Content

I’m watching the Event Horizon release of the black hole image (which is amazing) and it made me think: is there a good description of very-long-baseline interferometry out there?

Let me know if it already exists or if I should make a video on it. Or suggest any other video ideas!

Comments

Chris Roberts

Hmmmm, nope. Nice video, but doesn't really explain how the image is made :)

Doeke Zanstra

Maybe a follow-up on your Hexastix video. I'm still intrigued by it, and I'm planning to make one out of 19mm PVC pipe. However, when I wanted to calculate stuff (ultimately determine the length of the stix given a certain diameter. And/or with longer stix you can also make bigger ones (the one you made in the video I called a "Level 3" hexastix). Is there a hexastix formula? My highschool math is letting me down...

Jon EM

I know of some (such as <a href="https://vimeo.com/203837373)" rel="nofollow noopener" target="_blank">https://vimeo.com/203837373 )</a> that explain why it is useful, but not really how it works. Interferometry is a really elegant technique with links to classic experiments like Michelson-Morley, and modern measurements like rise-and-fall absolute gravimeters (and I guess imaging black holes :-) ). VLBI links extremely small scales (in terms of precise measurement) to extremely large (literally cosmic) scales.

John Bevan

FYI: the above link's accidentally included the close bracket; to get it to work just delete the last character. Good video though; thanks for sharing :).

John Bevan

I recall hearing a talk on Audio Forensics, where a recording of a (mono) phone call allowed analysts to work out the positions of people in a room thanks to short time differences between the main voices and their echos as they bounced off the apartment walls. That's slightly different to what's described here, but some of the ideas seem similar... i.e. one signal split across multiple paths, then collected at the same destination and analysed for differences between the resulting signals.

Isobel Taylor

I think you'd be able to add something useful. Shoot for the stars, Matt! Just not that big scary collapsed one.

Paul Chaplin

I've seen general explanations in astronomy channels before, but I'd love a more mathsy digging-into the finer details of it!

Sami Reinikainen

It's an upscaled version of Nokia 9 Pureview.

Matt Parker

Yes, Derek has made an amazing video but it doesn’t cover how the image was taken.

Matt Parker

Tempting! But with so many things to cover, and finite time to make videos, I try not to replicate what has already been covered. With occasional exceptions!

Matt Parker

I keep thinking I should do a follow up! I do have another big build video which is filmed but not edited (intersecting tetrahedra). I’ll get that done soon.

Matt Parker

Yes, the plate tectonic stuff blows my mind.

Matt Parker

That is incredible. I’ll try to look in to it. Sounds like accidental echolocation.

Jan-Willem Markus

I'm still mad for you deleting your rolling shutter footage. It helps having multiple video's on a subject. But the alternative video: "Rolling shutter on the cheap" was good. I understand the finite time problem. Many interesting things so little time.

Timur Sultanov

My proposal would be to do follow up about multiplicative persistence... I have a new conjecture for you: There exists a number K such that for any number greater than K multiplicative persistence will be at most 2 because the numbers resulting from multiplying all the digits in decimal form will always have a 0 in them. I have sent personal message here on Patreon with explanation of how I arrived to such conjecture and my estimate of what value of K could be.

14zRobot

I have been thinking about pi. Watched a video that made a case that we should stop calculating it, because how big of a circle we need to measure? This made me think of possible discoveries in computing or other areas that rose from trying to calculate pi. Google failed me so far, but it would be interesting if you have a take on it

Dig

I keep teaching myself time dilation and then forgetting it. I think about how time flowed for the astronauts in Interstellar, for example, and I can't wrap my head around it mathematically until I refresh myself. I mean, what did the guy on the ship see from orbit around the planet? Would they seem almost frozen? For the people on the planet, would the ship fly by a few times a second? What are the equations that show how it works?