Last Flight of the Delta IV and the Creation of Raptor 4 and Starship v3

Nice overview. Thank you for reminding people not to fall in to extreme dichotomies.

I hope that this time we go into space and stay, we don't change our minds :)

Moon first vs Mars first is a distraction. Space first is the only goal that matters. When we learn to live comfortably in space then we can go anywhere and do anything. Whether the planet below us is habitable becomes irrelevant as it is only a means to an end, not the end of the journey. This change in mindset changes everything.

The history and comparisons are so cool! Thanks Much

Not mentioned in efficiency comparisons: hydrogen requires a much larger tank than methane. Per Elon subcooled methane is more efficient than hydrogen.

Delta IV, now the buggy-whip of payload rockets.

I do not understand the lack of enthusiasm and applause; I'd be tickled to be part of that.

39:45 "Five or six refilling missions for every one mission that goes to Mars..." - I find it very hard to believe.

I used to wonder before about those forward flaps for long time that " why they don't put those flaps far ahead . that could increase torque around cg which could make belly flop more effective ( aerodynamic standpoint offcourse Tvs could do much more)" it would increase centre of pressure ahead which make it unstable during ascent but's not at all a probelm for modern day sensors and processors (n1 flashbaks💀) now they changed it. 👽

Would it be possible to add chepter breaks: main segment, supporting segments? (ref NSF video summaries) Still amazing 'lesson.' Yes, the RL-10 and RS-25 are amazing engines...but are they practical? Aside from the cost of each engine, what is the the difference in fuel costs? Thank you again.

On a different topic, somewhere around 10/15 years ago, I came across an article it might have been new Atlas, or another one. It was describing how to use 3D printing where was printed as a lattice, which actually gave more strength and lighter weight. However another interesting phenomenon was that this kind of structure not only lighter and stronger, it also engendered radiation protection. I suspect you may know this already, however in case you haven't I will pass this on to you I do not have the URL, so it may require some research. Scientia Habet Non Domus, (Knowledge Has No y) antiguajohn

Is this live?

I think Elon needs to fundamentally rethink the propulsion choices for the interplanetary vehicles and opt for a high ISP choice in the nuclear/electric (direct explosion to vasimr) family of engines. Near term methane works for ascent, it also works on Mars with some fiddling. Better long term solutions are needed though. If I had to bet on a solution I would go with "static" laser propulsion.

Something to discuss: The “Achilles heel” of Starship that no-one is talking about: The Human Factors element of riding Starship to a retro-rocket landing. Going to be a terrifying ride every time. Even when everything goes right.

The Valles Marineris on Mars is4,000 km. Long & upto 7 km. deep and has many side canyons that could be covered over and pressurized in segments.  Due to the depth there will be added radiation protection and also increased protection against meteor strikes that are on an angle. This would provide vast areas for habitation agriculture and the laws for expansion to other side canyons, linked by tunnels.  It would also allow by being segmented and in various canyons protection against a single failure event  I suspect they will also be a multitude of other advantages. Scientia Habet Non Domus, (Knowledge Has No Home) antiguajohn

50 tonne is very low, how can you refine in another 50 tonne. It just seems unlikely. The only thing that I think can give 50 tonne is to use aluminum.

What views does Elon Musk have that are outdated ?

make your voice alittle more exciting i often get a little bored while watching

For God sake, does every YouTuber think that they have to artificially induce Cam shake whenever they show a starship taking off. It’s Hollywood pathetic. I turned the video off as soon as I saw it, for God sake please stop doing that

I think that it's really interesting that in the Bible in Matthew chapter 13, Jesus himself says that the Son of Man will send out his angels to gather his elect from the ends of the earth and the ends of HEAVEN, so as a Christian I see that it is entirely possible that we will be living among the planets, if not the starts, by the time Christ returns to bring ultimate justice to the world (Cosmos) of humanity. The answer to the problems of the world, is to re-create the broken souls of humanity. The day is coming when He will sort out the truly evil people (deny and refuse Him) from those who are truly good (in true sincerity say yes to Him when they hear of Him). The sooner anyone starts the conversation with Him in their heart (the true meaning of Jesus saying the Kingdom is near is that He is near to all of us right now), the better life will ultimately be in the long term (ultimately for eternity).