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March 18, 2025

[Bonus] How Do Satellites NOT Crash. And How Can We Keep It That Way?

As we put more and more satellites in orbit, chances of them colliding also increase. How can we manage that? How can we make sure that Kessler syndrome won't happen and keep all those satellites from destroying each other? Finding out in this interview.

🟣 Guest: Dr. Sydney Dolan https://sydneyidolan.com/

Watch the video here (with no ads) or on YouTube: https://youtu.be/D9Jf41w1ChI

00:00 Intro

01:38 How satellites avoid collisions 

08:11 Close calls 

11:20 Detecting and modelling collisions 

20:28 Understanding orbits 

25:28 Autonomy 

32:18 How to get involved 

40:43 Current obsessions 

45:09 More interviews

Comments (10)

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רועי סיני · July 7, 2025

I don't get it. If you're fine with learning to code from an LLM then why even code yourself and not just tell the LLM the vibes and let it code for you? And if so why not skip the code entirely and just let the LLM decide how to solve the problem itself? And here we get to all the AI slop that's literally taking your job. So where do you draw the line? (I personally frown upon any interaction with an LLM and try to limit mine as much as possible, but it seems like you're more moderate than I am so I'm curious to know your opinion on the matter)

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Dániel · March 21, 2025

Do we know, what is the distance limit between two satellites, when they have to do the evasive maneuver?

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RMKay · March 18, 2025

Thank you ! I loved this interview. Very informative and I do feel better about the space junk, per se, and I’m hoping we can globally agree on space policy for all of its components as Dr Dolan outlined. Keep up the great work!

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betsy eyring · March 18, 2025

Loved this interview!!

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Ian Cooper · March 18, 2025

At the start of the Starlink Constellation project Elon was asked about the dangers of collisions but he dismissed them saying it was like a few thousand cars driving round the Earth. I thought at the time, look how well that turned out!

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Chris Senn · March 18, 2025

This is my 80th year of life. As I look at the world around me, it is easy to experience frustration, and to abandon hope for the future. However, as I watched this interview, I felt such optimism for the future. Sincere thanks to both Sidney Dolan and to Fraser for sharing your enthusism for life. I spend my days here in Finland working with wonderful children, and I hope that I can convey such enthusiasm to them, as well.

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Christopher L Todd · March 18, 2025

Awesome show and interview! When you started asking about how enthusiastic amateurs could get involved, I wish you had asked whether it is possible for amateur astrophotographers to participate in tracking objects in orbit. I know from personal experience how many satellite tracks show up in my "long" exposures (60 to 600 seconds), and I also know amateurs can and do make contributions to both variable star and exoplanet astronomy. But can amateurs make a significant contribution to the tracking of stuff in orbit?

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Tibby1980 · March 18, 2025

Thank you Dr. Dolan! Another great video where I was able to learn something.

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Brian Deschene · March 18, 2025

I looked up a term she kept using which was new to me even though I was getting gist of its likely meaning: ephemerides (noun, plural) A table or data file giving the calculated positions of a celestial object at regular intervals throughout a period. In case it helps anyone else.

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Tim Gleason · March 18, 2025

I’ve seen the term many times but I’m happy to hear someone pronounce it!