Elon Musk Space X launches person to ISS

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #180 on: March 10, 2019, 11:50:21 PM »

No, it "cannot be replicated" because as they were being built the parts were being custom fit with the skill and expertise of those assembling it.
With today's technology that is no longer required as we can have it made correctly with machining and have it pieces together without needing the custom fit.

How many F1 engines were built from start to finish?
Something like  the total of these:
    Sixty-five F-1 engines were launched aboard thirteen Saturn Vs.
    Ten F-1 engines were installed on two production Saturn Vs that never flew.
    A test engine is on display at the Powerhouse Museum in Sydney, Australia.
    An F-1 engine, on loan from the National Air and Space Museum, is on display at the Air Zoo in Portage, Michigan.
    An F-1 engine is on a horizontal display stand at Science Museum Oklahoma in Oklahoma City.
    F-1 engine F-6049 is displayed vertically at the Museum of Flight in Seattle, WA as part of the Apollo exhibit.
So what?
So 79 engines in total.
All those engines. It almost appears to be like a production line, doesn't it?
1967 to 1972.
5 years to build 79 engines and whatever engines were in the second and third stages.
5 years to build 13 saturn V rockets.
Custom made?

I presume all we built in the same factory by the same skilled men who knew the custom set up, right?
Yes, custom made! That few F-1 engines built is nothing like mass production.
The Rocketdyne F-1 engine hardly got out of the "prototype" stage and the production methods used in the 1960s were quite different from those used now.

Consider the Boeing 747, "By July 2018, 1,546 aircraft had been built". That was the whole system and many 747 components are common to other aircraft.

Quote from: sceptimatic
Just a lot of questions really. It's no wonder it's hard to accept this stuff, isn't it? For me I mean, not for the likes of you. I know what your stance is. To defend it and everything officially mainstream and fair play.
But you have your, "lot of questions" but start from a complete ignorance about these things and the assumption that all NASA says is lies.
And what engines were in the second and third stages of these so called working saturn V rockets?

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #181 on: March 11, 2019, 12:30:54 AM »
No they actually don't.
How many fans are inside your phone?
What about your watch?
Your calculator?

There are plenty of electronic devices which work just fine without any special heat sink and without a fan. That is because they don't produce much heat as they don't consume a lot of power.
Absolutely. Do you know why?
It's because they are in ATMOSPHERE.
The low heat created is easily dissipated without a fan.
A lap top is components and those components would be just like your fictional space satellite set up as told to us.
I'm sure it would be full of stuff needed to so call transmit a relay from sci-fi space as they would have us hang onto.
So, never mind about forced convection. Any components working in a extreme low pressure environment will burn out.
They actually wouldn't work at all in your space vacuum but that's another argument.
Shout and scream all you want but your satellites in space and rockets to take them...are nonsense in how we've been told.
If there's some other hidden stuff then fine. It still doesn't take away from the massive potential of us being massively duped.
I don't mean you. I'm well aware you believe everything official or at least follow that line regardless.



Quote from: JackBlack
Radiative transfer of heat is simple. It just isn't simple in your fictional space vacuum.
The environment doesn't change it much except for the absorption of that radiation and the velocity at which it propagates.
Radiative transfer of heat works better in a vacuum as you don't have the air immediately in front absorbing the energy which can then in turn heat up the object.
No it doesn't work. Nothing works in a vacuum that you adhere to. Nothing.

Quote from: JackBlack
All those engines. It almost appears to be like a production line, doesn't it?
1967 to 1972.
 5 years to build 79 engines and whatever engines were in the second and third stages.

5 years to build 13 saturn V rockets.

Custom made?
Those were launch dates, not the dates they were made, and you left out 1973.

And yes, roughly 2 every year. That doesn't sound like a production line.
As a comparison, the original Ford motors production line allowed them to make a car every 30 minutes.
We aren't talking about Ford cars, were talking about supposed massive working rockets that apparently have a 3000 tonne lift off weight.
All specialist stuff I'm led to believe. Custom with engines so clever that only the super skilled men of teh time could weld them and put them together. Today's men and women apparently have went backwards to such a degree as to not even be funny, it appears.

From the 60's to present day we are now back to worrying about putting a man inside a rocket and instead using a dummy.  ;D
If people can't see the utter pee take getting done to them then anything I say will certainly go out with every tide.
I'll just keep pointing it out.

I know I know I know jack....you know for certain it's all real and I'm just distracting from stuff and what not and I'm a troll and ignorant and a ridicule artist and blah blah blah. I know I know I know, you tell me time and time and time and time, again.

 :D

Quote from: JackBlack
You have a laptop in your space.
Laptops cool via forced convection, not radiation.

Try again.
Is you satellite innards made of different components?
23,000 miles out some of them are supposed to be.
Do they relay back on a watch battery?
What is cooling the components?

Quote from: JackBlack
Light is one simple form of this radiation, which can easily be observed to pass through vacuums, with plenty of vacuum chamber tests still allowing you to see what is inside.
If radiation couldn't pass through a vacuum then you wouldn't be able to see those objects.
Light is observed through low pressure, not a vacuum.
It's the reason why you can see a clearer sun in the sky and better light from the reflection. Why?
Because you're looking up into lower pressure the same as you're looking into lower pressure inside a chamber.
I know it's lost on you.
Quote from: JackBlack
Can you tell me how anything can move in a nothingness?
That has already been explained to you.
Stop bring up the same garbage questions when you have no intention of accepting the answers.
What is there with nothingness to stop it moving? NOTHING!

Now quit with the pathetic distractions.
Either admit your claims are pure BS, or defend them. Show that the rocket will blow itself up. Show that the flow rate is impossible.
It's not me doing the distractions but I know someone who is doing them....Jack.

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #182 on: March 11, 2019, 12:33:46 AM »
Can you tell me how anything can move in a nothingness?

I'm assuming you mean rockets?

The combustion takes care of that. When the gases are pushed out of the engine (sorry for my English by the way) it pushes the rocket forward (for every action there is an opposite and equal reaction). It doesn't matter that it's a vacuum for that to happen. The more power it has, the faster it will go forward. This works the same as when the rocket takes off from the launch platform.
Can you tell me how anything can move in a nothingness?
Your vacuum is a nothingness. It has no medium. Tell me how anything can move in it to the point of not having an up or down or sideways. Basically how can something just float in nothingness?

Explain what's happening for this to happen.

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #183 on: March 11, 2019, 12:36:42 AM »
Can you tell me how anything can move in a nothingness?
Much easier than in a "somethingness" because there is no resistance (friction if you like) in a "nothingness" and a rocket can be accelerated by ejecting mass out the back - easy peasy.
You're more intelligent than that, surely?

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Stash

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Re: Elon Musk Space X launches person to ISS
« Reply #184 on: March 11, 2019, 12:54:17 AM »
Can you tell me how anything can move in a nothingness?

I'm assuming you mean rockets?

The combustion takes care of that. When the gases are pushed out of the engine (sorry for my English by the way) it pushes the rocket forward (for every action there is an opposite and equal reaction). It doesn't matter that it's a vacuum for that to happen. The more power it has, the faster it will go forward. This works the same as when the rocket takes off from the launch platform.
Can you tell me how anything can move in a nothingness?
Your vacuum is a nothingness. It has no medium. Tell me how anything can move in it to the point of not having an up or down or sideways. Basically how can something just float in nothingness?

Explain what's happening for this to happen.

He already did. N3rdL:


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JackBlack

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Re: Elon Musk Space X launches person to ISS
« Reply #185 on: March 11, 2019, 01:00:39 AM »
Absolutely.
Glad you can admit you are wrong and we can move on from this pathetic distraction.

Any components working in a extreme low pressure environment will burn out.
You are yet to even begin attempting to show this.
You have repeatedly failed to address the reality of radiative heat transfer and its applications in space.


Shout and scream all you want but your satellites in space and rockets to take them...are nonsense in how we've been told.
You mean shout and scream all YOU want but they remain reality which you are completely unable to show a single problem with.


Nothing works in a vacuum that you adhere to.
Again, you have been provided evidence showing that is pure BS.
Now stop just asserting BS.
Either back it up or don't claim it at all.

We aren't talking about Ford cars
Doesn't matter. The point remains the same.
2 every year is not production line scale. Instead it is custom made scale.
Yes, they are big, but that doesn't magically mean they aren't custom made rather than rolling off a production line.

Custom with engines so clever that only the super skilled men of teh time could weld them and put them together. Today's men and women apparently have went backwards to such a degree as to not even be funny, it appears.
No, we can make them, they just wont be exactly the same.
Just like 2 programmers can code a program which functions almost identically, yet the code underneath will be different.

From the 60's to present day we are now back to worrying about putting a man inside a rocket
No, we use unmanned tests for new rockets.
You are aware they even do a bunch of unmanned tests with cars? Or are they fake news now as well?

If people can't see the utter pee take getting done to them
No, we can see your pathetic pee take.

Is you satellite innards made of different components?
It is the cooling mechanism used and the design of it that matters.

Light is observed through low pressure
i.e. a vacuum.
You playing pathetic semantics doesn't magically change it.
These low pressure environments (like space) are vacuums.

It's the reason why you can see a clearer sun in the sky and better light from the reflection. Why?
You don't get better light from a reflection.
But you can easily see the effects of passing through air by comparing the sun at midday with the sun at sunset or sunrise.

It's not me doing the distractions
If that was the case you would have just focused on your original lie of these rockets allegedly going to blow themselves apart rather than run off on all the distractions you did.

Now going to back up your claims or admit they are lies?

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rabinoz

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Re: Elon Musk Space X launches person to ISS
« Reply #186 on: March 11, 2019, 01:14:28 AM »
Can you tell me how anything can move in a nothingness?
Much easier than in a "somethingness" because there is no resistance (friction if you like) in a "nothingness" and a rocket can be accelerated by ejecting mass out the back - easy peasy.
You're more intelligent than that, surely?
And what is wrong with that?
In the atmosphere some of rocket's thrust has to overcome the atmospheric drag.
In a vacuum, however, there is no atmospheric drag so all the thrust contributes to the acceleration of the rocket.

In addition to that, rocket engines generate more thrust in a vacuum than in the atmosphere but that involves maths so I won't bother explaining why.
But this second effect means that the thrust of the Rocketdyne F-1 was:
        1,522,000 lbf (about 690,000 kg.force) at sea level but
        1,746,000 lbf (about 792,792 kg.force) in a vacuum.
I know that you'll ridicule it but that would just prove you have no understanding of the operation of rocket engines.

Re: Elon Musk Space X launches person to ISS
« Reply #187 on: March 11, 2019, 01:20:51 AM »
Scepti, did you know that if a human being was exposed to the vacuum of space without the use of protective clothing, it would take quite some time for them to freeze. Do you know why?
Turkish joke. A prisoner goes to the jail's library to borrow a book. The librarian says: "We don't have this book, but we have its author"

Re: Elon Musk Space X launches person to ISS
« Reply #188 on: March 11, 2019, 09:15:54 AM »
Scepti, did you know that if a human being was exposed to the vacuum of space without the use of protective clothing, it would take quite some time for them to freeze. Do you know why?
Scepti denies space, vacuums and probably even clothing by this point.
Quote from: mikeman7918
a single photon can pass through two sluts

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if Donald Trump stuck his penis in me after trying on clothes I would have that date and time burned in my head.

Re: Elon Musk Space X launches person to ISS
« Reply #189 on: March 11, 2019, 10:48:52 AM »
Sceptimatic is now confusing a (near) vacuum's lack of particles with having a lack of dimension. You don't need matter to be present in every part of space for the dimensions of time and space to exist in those parts, just the gravitational field created by the matter and energy that does exist in the universe. So it's possible to move about in a vacuum (or near vacuum) in space and spacetime.

Re: Elon Musk Space X launches person to ISS
« Reply #190 on: March 11, 2019, 10:58:56 AM »
Sceptimatic is now confusing a (near) vacuum's lack of particles with having a lack of dimension. You don't need matter to be present in every part of space for the dimensions of time and space to exist in those parts, just the gravitational field created by the matter and energy that does exist in the universe. So it's possible to move about in a vacuum (or near vacuum) in space and spacetime.

Thats too high level for scepti.

Hes still needs to come to terms with a horizontal vs vert momentum decelleration is no different in theory if all forces are accounted for.

Re: Elon Musk Space X launches person to ISS
« Reply #191 on: March 11, 2019, 11:06:54 AM »
Can you explain how there would be sub zero temperatures in your space?
How is temperature measured?

What would you take to space to measure the so called vacuum temperature?

Vacuum of space itself has no temperature.
But things heat up or cool down depending on how much photons it receives. Here's another nice article explaining this.

Why doesn't it have a temperature?
Temperature is the speed at which the electrons orbit in their atoms.
No atoms means no electrons orbiting, means no temperature. No thermal mass.
Temperature is usually measured either through the dimensional changes in matter, or in the level of radio waves or light it emits due to back body radiation.

Re: Elon Musk Space X launches person to ISS
« Reply #192 on: March 11, 2019, 12:41:23 PM »

Temperature is the speed at which the electrons orbit in their atoms.



Re: Elon Musk Space X launches person to ISS
« Reply #193 on: March 11, 2019, 12:46:58 PM »

Temperature is the speed at which the electrons orbit in their atoms.




If I can't have orbiting planets and galaxies and all that can't I at least have orbiting electrons?

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #194 on: March 11, 2019, 12:55:56 PM »
Scepti, in the 1820's it was people such as yourself that believed that travelling on a train at speeds over 20mph would cause men to asphyxiate and women to disintegrate. Where is the similarity to you? Some people just have no ability to to tie existing data, experimentation and experience together into a cohesive knowledge base on which to build on. You are intentionally and wilfully uneducated to the point that anything new from a scientific or technical point of view seems like either magic or fakery.
No need to waste your time using stuff like this.
I'm questioning the sci-fi passed off as sci-fa.
I'll leave the 20 mph asphyxiation for whoever thought it up.

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #195 on: March 11, 2019, 01:00:13 PM »
Can you tell me how anything can move in a nothingness?
Much easier than in a "somethingness" because there is no resistance (friction if you like) in a "nothingness" and a rocket can be accelerated by ejecting mass out the back - easy peasy.
You're more intelligent than that, surely?
And what is wrong with that?
In the atmosphere some of rocket's thrust has to overcome the atmospheric drag.
In a vacuum, however, there is no atmospheric drag so all the thrust contributes to the acceleration of the rocket.

In addition to that, rocket engines generate more thrust in a vacuum than in the atmosphere but that involves maths so I won't bother explaining why.
But this second effect means that the thrust of the Rocketdyne F-1 was:
        1,522,000 lbf (about 690,000 kg.force) at sea level but
        1,746,000 lbf (about 792,792 kg.force) in a vacuum.
I know that you'll ridicule it but that would just prove you have no understanding of the operation of rocket engines.
Don't make out I know nothing about rocket engines while pretending that you do.

I only need to know one thing.
That one thing is as clear as can be.
Rockets can not work in extreme low pressure, never mind fictional space.l

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #196 on: March 11, 2019, 01:01:11 PM »
Scepti, did you know that if a human being was exposed to the vacuum of space without the use of protective clothing, it would take quite some time for them to freeze. Do you know why?
Go on, tell me why.

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #197 on: March 11, 2019, 01:06:55 PM »
Scepti, did you know that if a human being was exposed to the vacuum of space without the use of protective clothing, it would take quite some time for them to freeze. Do you know why?
Scepti denies space, vacuums and probably even clothing by this point.
I'm ok with the clothing part. ;)

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #198 on: March 11, 2019, 01:08:02 PM »
Sceptimatic is now confusing a (near) vacuum's lack of particles with having a lack of dimension. You don't need matter to be present in every part of space for the dimensions of time and space to exist in those parts, just the gravitational field created by the matter and energy that does exist in the universe. So it's possible to move about in a vacuum (or near vacuum) in space and spacetime.
More sci-fi. Don't waste your time or mine with that nonsense.

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #199 on: March 11, 2019, 01:09:04 PM »
Can you explain how there would be sub zero temperatures in your space?
How is temperature measured?

What would you take to space to measure the so called vacuum temperature?

Vacuum of space itself has no temperature.
But things heat up or cool down depending on how much photons it receives. Here's another nice article explaining this.

Why doesn't it have a temperature?
Temperature is the speed at which the electrons orbit in their atoms.
No atoms means no electrons orbiting, means no temperature. No thermal mass.
Temperature is usually measured either through the dimensional changes in matter, or in the level of radio waves or light it emits due to back body radiation.
Agitation of matter. As simple as that.

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JackBlack

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Re: Elon Musk Space X launches person to ISS
« Reply #200 on: March 11, 2019, 01:50:15 PM »
Temperature is the speed at which the electrons orbit in their atoms.
Not even close.

For a monoatomic gas, temperature relates to the velocity of the gas.
For a very low density this acts as individual particles moving around rather than as a gas.
For other objects, additional aspects of the temperature include rotation of the molecules and vibration.

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JackBlack

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Re: Elon Musk Space X launches person to ISS
« Reply #201 on: March 11, 2019, 01:54:07 PM »
I'm questioning the sci-fi passed off as sci-fa.
No, you are rejecting reality, by pathetically ridiculing it because it shows you are wrong.
You are completely unable to substantiate any of your alleged problems.

Don't make out I know nothing about rocket engines while pretending that you do.
You clearly don't know how they function because you keep on asserting pure BS like this:
Rockets can not work in extreme low pressure, never mind fictional space.l
PROVE IT!
So far everything has shown you are wrong. All we have to indicate they can't is your baseless claim.
So no, you don't know that. You just foolishly believe it.

The reality is that they can work in low pressure.
You are yet to substantiate why the 2nd law of motion magically requires air.

Now, going to start backing up your claims, or will you just continue making wild false assertions?

P.S. Sci-fa typically stands for science fantasy, used to distinguish it from sci-fi as not being possible.

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rabinoz

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Re: Elon Musk Space X launches person to ISS
« Reply #202 on: March 11, 2019, 06:43:29 PM »
Sceptimatic is now confusing a (near) vacuum's lack of particles with having a lack of dimension. You don't need matter to be present in every part of space for the dimensions of time and space to exist in those parts, just the gravitational field created by the matter and energy that does exist in the universe. So it's possible to move about in a vacuum (or near vacuum) in space and spacetime.
More sci-fi. Don't waste your time or mine with that nonsense.
You made the claim that "it" is nonsense, so YOU prove that it is nonsense!

We see so many unsubstantiated claims come from you but never a trace of evidence to back them up.

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rabinoz

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Re: Elon Musk Space X launches person to ISS
« Reply #203 on: March 11, 2019, 07:05:53 PM »
Don't make out I know nothing about rocket engines while pretending that you do.

I only need to know one thing.
That one thing is as clear as can be.
Rockets can not work in extreme low pressure, never mind fictional space.l
As long as you claim things like "rockets can not work in extreme low pressure" I'll claim that you "know nothing about rocket engines".

Get me Steve!

Here from someone ;D that knows far more about calculating the thrust of a rocket engine that you ever will:

How do you like them apples ;)?

Look at the (pe - po)Ae term where:
     pe is the exhaust pressure at the end of the bell,
     po is the outside pressure and
     Ae is the area of the exit from the bell.
From that, it is obvious that the thrust is highest in a near vacuum where po approaches zero.

Oops, I forgot that you don't believe in sums so forget all that.
But if you are not prepared to do a few sums it is obvious that you "know nothing about rocket engines".

End of story!

Re: Elon Musk Space X launches person to ISS
« Reply #204 on: March 11, 2019, 09:19:49 PM »
Whos steve?

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #205 on: March 11, 2019, 11:09:33 PM »
I'm questioning the sci-fi passed off as sci-fa.
No, you are rejecting reality, by pathetically ridiculing it because it shows you are wrong.
You are completely unable to substantiate any of your alleged problems.

Don't make out I know nothing about rocket engines while pretending that you do.
You clearly don't know how they function because you keep on asserting pure BS like this:
Rockets can not work in extreme low pressure, never mind fictional space.l
PROVE IT!
So far everything has shown you are wrong. All we have to indicate they can't is your baseless claim.
So no, you don't know that. You just foolishly believe it.

The reality is that they can work in low pressure.
You are yet to substantiate why the 2nd law of motion magically requires air.

Now, going to start backing up your claims, or will you just continue making wild false assertions?

P.S. Sci-fa typically stands for science fact fantasy, used to distinguish it from sci-fi as not being possible.
Is how I put it forward.
You'll get there.

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #206 on: March 11, 2019, 11:13:57 PM »
Sceptimatic is now confusing a (near) vacuum's lack of particles with having a lack of dimension. You don't need matter to be present in every part of space for the dimensions of time and space to exist in those parts, just the gravitational field created by the matter and energy that does exist in the universe. So it's possible to move about in a vacuum (or near vacuum) in space and spacetime.
More sci-fi. Don't waste your time or mine with that nonsense.
You made the claim that "it" is nonsense, so YOU prove that it is nonsense!

We see so many unsubstantiated claims come from you but never a trace of evidence to back them up.
The very same unsubstantiated claims come from people like yourself, unless you think Hollywood type films are your evidence as well as made up equations to suit whatever size fantasy rockets are put before the public.

You're sat there reeling off nothing more than book and picture feed by mimicking.

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sceptimatic

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Re: Elon Musk Space X launches person to ISS
« Reply #207 on: March 11, 2019, 11:17:47 PM »
Don't make out I know nothing about rocket engines while pretending that you do.

I only need to know one thing.
That one thing is as clear as can be.
Rockets can not work in extreme low pressure, never mind fictional space.l
As long as you claim things like "rockets can not work in extreme low pressure" I'll claim that you "know nothing about rocket engines".

Get me Steve!

Here from someone ;D that knows far more about calculating the thrust of a rocket engine that you ever will:

How do you like them apples ;)?

Look at the (pe - po)Ae term where:
     pe is the exhaust pressure at the end of the bell,
     po is the outside pressure and
     Ae is the area of the exit from the bell.
From that, it is obvious that the thrust is highest in a near vacuum where po approaches zero.

Oops, I forgot that you don't believe in sums so forget all that.
But if you are not prepared to do a few sums it is obvious that you "know nothing about rocket engines".

End of story!
I see all the thrust coming out of the rocket against the?....atmosphere. It can't be against nothing.....unless you can show me internally in that rocket where the opposite reaction is to the action from that nozzle.

Come on...once and for all show me. Let's see you point to the places where this reaction to action takes place.

Show me where this push occurs to make that rocket go high into the sky without using the atmosphere as a resistance, externally.

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rabinoz

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Re: Elon Musk Space X launches person to ISS
« Reply #208 on: March 11, 2019, 11:44:23 PM »
Whos steve?
Should I include an Australian Slang to English dictionary ;D?
Quote from: Green’s Dictionary of Slang
Get me, Steve? (also Got me Steve?)
          (Aus.) are you with me? do you understand?

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rabinoz

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Re: Elon Musk Space X launches person to ISS
« Reply #209 on: March 12, 2019, 12:22:24 AM »
I see all the thrust coming out of the rocket against the?....atmosphere. It can't be against nothing.....unless you can show me internally in that rocket where the opposite reaction is to the action from that nozzle.
It's not against nothing it's against the mass of burnt fuel being pushed extremely rapidly out the back.
At the exit of the bell about 4 tonnes per second of burnt fuel is there to push against. That beats a bit of atmosphere any day!

If you like you can use the balloon analogy as in this old post (and AusGeoff instead me)
I remember the degree crap septic. Aus, how come you seem to have a hard time nutting out that septic is an idiot?.

I guess I'm just being generous of spirit, and giving the guy numerous opportunities to redeem himself.  Unfortunately—and being a habitual liar—he seems unable to do so.  He obviously prefers to live in some sort of self-contained fantasy world invented inside his tiny brain.

He's also apparently oblivious to the simple fact that everybody else here regards him as some sort of whack-job, or simply a major and persistent troll.

The fact that he can't comprehend even the simple physics of the grade-school demo of the balloon "rocket" is a clear indication that he has not the faintest understanding of science.  Which in the 21st century is kinda frightening.

This might clarify the forces acting on the balloon "rocket"—for sceptimatic's benefit:



The bottom diagram represents a "real" rocket nozzle.

And assuming that sceptimatic is unfamiliar with Newton's third law of motion:  "For every action, there is an equal and opposite reaction".
In the top left diagram the balloon has equal pressure pushing outwards in all sides so there nett force adds up to zero.
But in the top right diagram the balloon has equal pressure pushing outwards in all sides except for where it is open to the atmosphere.
Over that area the pressure is just the outside pressure, atmospheric pressure.
So there is a force of (inside pressure - outside pressure) x nozzle area.
This is only part of the thrust but it shows that some thrust can easily be explained and why a higher outside pressure decreases the thrust.