Thank you everyone for engaging with this video through views, likes, suggestions and very kind words! I'm really glad to see many of you enjoying it!! Creating these animations alone from start to finish generates an array of challenges like balancing music/voice volumes, depth of details and number of topics covered. I appreciate the suggestions! Stay tuned as another animation is in coming together quiet well! As for the second stage, I believe they are left in their orbit to eventually fall back into the atmosphere where they burn up. Cheers!!

First time in 60+ years I've ever understood what is obvious, when explained so succinctly. Thanks 🤔

This channel is severely under appreciated.

This is what UKposts should be! Beautiful talent, no clickbait, no ads. Bravo!

I almost never write comments, however, I really feel the need to tell you how much I appreciated watching this video. The animation, the content, the balance between details, and not making too long of a video, all perfect! I look forward to any future video from you.

My dad showed me this video, how does this not have more views?? This is not only an amazing explanation but also an amazing animation Edit: video blew up, comment is outdated, glad I helped push this out into the algorithm!

I guarantee you this will be shown in many classrooms for YEARS to come! You should be proud of this! 👏

As a graduate student who spent a painful amount of time studying aerospace propulsion, I can say that your video is a great introduction material to space engineering. Good job!

The orbital speed curve as it transitions from a ballistic curve to orbit was really nice. The engine efficiency curves were also, really well described and animated. Well done, and thanks!!

I did not know the main differences between the atmosphere and vacuum merlin engines until now! Thank you!

I just found a GEM of a channel under 1K. You sir have earned my sub and i can't wait to see where you go. Keep it up. Amazing animations. High quality info. Freaking amazing!!!!

7:05 Not "lowering its heading," but rather, "pitching down" or "decreasing its flightpath angle relative to the horizon," etc. "Heading" is the direction it's pointed in the horizontal plane (e.g, north, southwest, 133 degrees true, 225 degrees magnetic, etc.).

Nicely animated, brilliantly narrated and explained. Your voice modulation and diction are great! Delightfully clear. The only sore point is the loudness of the background music in the initial sections in this video. Kudos.

I’ve watched so many explainers and animations over the years and this one is up there with the best. You have a talent that is world class. Thank you!

I learned more from this video than I ever did in my science classes...

That was an exceptional explanation! I'm going to show this to my nephews in hopes they start following Spacex more closely.

Your channel has huge potential

I only wanted to know why they don't recover the second stage but I learned more than that. Thank you for this video

Brilliant work! There's not even one flaw. Perfect script, prefect explanations that anyone can understand. Excellent narration, very good animations. Just perfect. You have a new subscriber here and thank you sir for your excellent work.

10:07 - not friction but compression, the air can't move sideways quickly enough, it gets compressed -> warmer

Your animations are great! Did you do these astounding animations by yourself?

Great idea breaking this up into multiple parts, visible from the bar on the bottom! This way, people comfortable with rocket science basics and knowledgeable about how the first stage lands can skip to just the right part them, and those who need a refresher or who are learning about this subject for the first time can watch the whole thing.

The quality and information in these videos is such high quality, subscribed, keep up the good work.

This was perfect. The world needs more videos with this level of detail. Thank you for your time!

So this guy's an animator, has an understandable voice and accent, does his own research, and explains things so detailed for us to understand? Wonderful channel, would like to see more of these soon.

I don’t know who you are, or where you live, but I found your UKposts channel, and you’re killing it.

This is seriously one of the best if not the best youtubers for these types of videos. Not only are the animations great but the facts and overall presentation is amazing.

i already knew the answer, but the title and thumbnail caught my eye, good job man, keep this up

BRILLIANT!!! Great explanation of the complex physics going on. That is very, very hard to do, but you have done a great job!

I learned more about launching rockets in these 10+ minutes than I've learned in other 50+ years of my life. Very good explanation and well presented.

Very well explained video! The only thing I’d add would be that, re entering from orbital velocity is not 4 times hotter than coming in at 2km/s in the case of a Falcon 9 booster. Re entry heating goes up by the cube of velocity, so a second stage coming in from orbital velocity would experience 64 times as much heat as a sub orbital falcon 9 booster that is only traveling 25% of the second stage’s velocity. That’s a very important thing to consider.

This channel going to to have 1 million subscribers soon

Nice video. Covered the topic well. Thanks. One small thing.... turn the background music down or ditch it in my opinion. Look forward to more.

Beautiful man, great job with this video. It's amazing you did this all by yourself. Congrats for making such a great content, keep up with it!!! :)

It is amazing how low the pressure is in the nozzle. Also, the video explains very well the difference between the first and second-stage efficiency of each altitude or outer pressure. Summary to rocket factory: You cannot get all, have to be some compromise.

This channel will really grow if you continue to make content of this quality. Keep up the great work!

This channel is highly underrated. This video is awesome. The only thing that could be optimized is the sound quality. But thats not too bad. Thank you for this amazing animation.

As an ex-physicist, I was gratifyingly stunned to learn aspects of rocket science I hadn't even appreciated existed. Very cool! That earned you my SUBSCRIBE.

This video is amazing. Nicely explained, good pace, fitting animations. Thank you!

This is one of the best, most educational videos ever!! Thank you so much!! This is so much appreciated for everyone a fan of SpaceX, Space or rockets!!

i see several comments already pointing out how i feel about this. this all looks like very good work and sincerely i hope you dont stop making these because you arent getting a ton of views yet.

This video blew my mind. It has ingrained core concepts of astrophysics in my head in the most effortless way. Please keep up this content!!!!!

Holy hell, my man just taught me rocket science in 10 minutes? Goodness!

The thought that comes to mind is that with the second stage in orbit, there might be a recovery opportunity using a Starship to capture it in a payload bay and land it back on Earth.

Only a matter of time before your channel blows up :) This video was awesome. Thanks!

Brilliant explanation. Seems like you are putting a lot of effort into these videos. Much appreciated.

Your videos are awesome and the effort you put in to make each of them happen in the ways they did clearly show your commitment and passion. You've mastered the art of explaining and breaking down very scientific and technical terms and logic to layman. Please keep doing what you are doing because your channel has a huge educational value and undeniable potential to bring knowledge to the masses. Thank you for helping to bring difficult to access scientific topics and making them accessible to everyone. Your content deserves more recognition and even more subscriptions.

Underrated Channel! Awesome video.

You don't mention anything about what happens to the second stage though? Does it stay stay in space or burn up when coming too close to the earth?

Great animation and explanation. I liked how you put the numbers in context! Loved the vid

_Outstanding_ production! Beautifully done and *brilliantly* explained. Hope this channel _launches into the stratosphere!_ 👍🏼

Super good quality video! Starship and starlink next? ;)

Thanks!! I finally found an answer to this question that makes sense. Everybody else gave vague answers or very technical ones.

Best mix of animations and explaining a very complex subject.

Thanks for making us all understand Space a better way. Kudos to your simplicity

I like that you added all the numbers for the exhaust. Puts things into perspective. I also wonder why they don't build some kind of variable nozzle like jet engines have. No the entire thing, just something that attaches to the end of the existing nozzle on the sea level engine.

Yo, as a self proclaimed Space Geek, I really enjoyed how you simplified and explained the process involved with recovery of the booster. Great work!!! I found this video on the same day that SpaceX finally tested SN15 and sucessfully landed it!!! Def subbed. Can't wait to see what else you got!!

This might be the best rocket UKposts video ever! Great job 👏🏾

I am a SpaceX enthusiast. This is the BEST animation, combined with a perfectly paced explanation of the complex 'basics' of rocketry. Thanks!

Hey buddy don't you stop making these you'll make some cash soon enough you got this man's

Starship will be the first fully reusable rocket in the world. No part will be wasted. I am so excited with the progress SpaceX is making!

What a great explanation! I didn't really know about the details of the different engine designs. Well done!

Superbly produced. I always wondered about stage 2.

This was a great animation. Now my lizard brain finally understands 😸. One question so what happens to the second stage ?is it still in orbit or does it get pushed out into space?

I hope they launch recovery missions to prevent Kesler syndrome.

Amazing. Great animations and well researched information. Keep it on! :)

That was a blooming brilliant video. Thank you for explaining it so well.

I love these animations keep it up you’ll be huge Edit: reminds me of Mustard and real engineering

So what happe to the second stage engine ?

What a great explanation of how it all works. Super simple to understand. Great work!

This channel is seriously underrated! Deserves way more followers!!

Great video! On the About section of your channel tell us a little about yourself, do you have a science or aeronautical background?

8:03 Can someone perhaps explain this? After MECO, how does the 1st and 2nd stage separate, since they are both going as a unit at the same speed? How does, or what enables the 2nd stage "push" away from the 1st stage? Thanks!

This was incredible! Keep up the Xcelent work!

This video is very concise and very well animated. Congrats on a good job

As a retired engineer (Electronics) I found this fascinating, a huge thanks for putting this out!

I don't comment on UKposts videos a lot, but when I do, it's because it's a great video. Well done.

Nice work, thank you! Looking forward for the next one. Stay healthy 😉

Finally I found a good channel that does things in a simple way and doesn't use the assistant voice

Wow 7000 subs now... in two weeks ! 😮 It took me more than the last 2 years... to lose 100 subs 😂 I'm so happy for you. You deserved it. 😃 Keep it up 😊

How about tempering and heat treatment of Iron and it's effects on the strength of a say blade?.... Along with explaining the different types of tempering techniques used throughout the ages (japanese Steel 👌)

Wow! It´s very difficult to explain such a difficult topic in a simple way, it´s wonderful. Congratulations, the animations and explanations are great. This video answered a lot of questions I had long time ago and I could not understand until now, as I didn´t find the proper explanation. Thanks a lot!

If they continue to post videos like this, this channel is gonna be a HIT, Already subscribed👍

I think 3Elon has said that it is cheaper to manufacture a 2nd stage than to get a recovery vessel to pick it up

Im your 300th subscriber...... I'm sure that you hit 300k subscriber soon....😀

Wow. Excellent production. Learned a lot. Thanks and keep up the good work.

This was such an awesome and cler explanation, definitely sticking around for more!

Will you remember us when you get famous?

you still do not answer the question where do 2nd stage go once separation from payload

A brillant video ! I loved it from the begining to the end. Thanks for all those clear informations, you did a great job !!

I know a little bit about atmospheric pressure and density that could burn the 2nd stage at that speed if it goes into re-entry, but I haven't know about that flow separation that could damage the nozzle, I hope that in the future spacex could find a way out to recover it's 2nd stage so that the space junk comes from every rocket launch from SpaceX could be minimized or even reduced to 0, which also could cuts the launch cost a little bit. Thanks for the explanation by the way, really understandable

If the second stage isn’t recovered, does it stay in orbit?

Actually: Friction isn't the main cause of heating during reentry. In fact, there is very low friction between the body that is entering the atmosphere, because there is a shock wave formed in front of the body which acts as a wall, seperating the body from the fast moving air. Between this wall and the body there is a pocket of air which moves hardly at all. The real cause for reentry heating is the compression of air in front of the body. The "wall" is a layer of strongly compressed air. The body gives it's energy into the system by compressing the air. So there is a shift from kinetic energy of the body to energy used for the compression which is then given of as heat (thermal energy) because the air doesn't want to be compressed (if you'd like to express it this way). The next time you see a mid to high quality mountainbike look for a sticker on the suspension that warns you from the cylinder getting hot during intensive use. Alternatively you could try using a pump to pump up something as fast as you can and then touch the cylinder afterwards -> You will realise that it becomes pretty warm. And if you could do that with your bare hands it's not hard to imagine what happens when an object going 27.000km/h hits the atmosphere

So happy to have discovered this awesome channel!

What an awesome video, the animations and narration are top notch! Great work!

Rocket science is in large part all about nozzles.

But why doesn't spacex recover the fuel?

Top notch content. Instant subscribe and thank you for such beautiful knowledge.

SpaceX > Saves two thirds for the first time in rocket history This channel > Still not enough!! \-0-/

Shorter: Vacuum engines are just that, not made for atmosphere.