From Newsgroup: sci.misc

Why Returning From Mars ls Impossible - Feynman's Warning

Physics with Feynman

You've seen the headlines: "Mars by the end of the decade." There's
just one detail they keep glossing over -- actually coming back. And
the physics of that return trip is staggering. It's not a bigger Moon
mission. It's an entirely different beast, governed by an equation
that punishes ambition exponentially. In this video, we explore the
real engineering nightmare of a Mars return mission, drawing on the
fundamental physics

https://www.youtube.com/watch?v=0BqLcGEbIHQ

Musk lives in a fanasty world...Dick Feynman died February 15, 1988.

Tsiolkovsky, a Russian school teacher, knew this back in 1903

Tsiolkovsky, K. "Exploration of Outer Space by Means of Rocket
Devices" (1903)

Feynman, R. "The Feynman Lectures on Physics," Volume I, Chapter 10: Conservation of Momentum (1963)
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From Newsgroup: sci.misc

On Sat, 04 Apr 2026 07:38:25 -0500, JAB <here@is.invalid> wrote:

Why Returning From Mars ls Impossible - Feynman's Warning
Physics with Feynman

So, I asked Google's AI: "In the book "Exploration of Outer Space by
Means of Rocket Devices" by Tsiolkovsky, K., would a return trip from
mars require more additional rocket fuel?"

AI - In Konstantin Tsiolkovsky's seminal work, Exploration of Outer
Space by Means of Rocket Devices (1903), the mathematical framework he established confirms that a return trip from Mars would indeed require significantly more rocket fuel than a one-way trip.

This is due to the exponential nature of the Tsiolkovsky Rocket
Equation. To return from Mars, a rocket must carry not only the fuel
for the return leg but also the fuel required to transport that
"return fuel" from Earth to Mars in the first place. =============================================

Musk wants to go to the Moon now.....

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From Newsgroup: sci.misc

On Sat, 04 Apr 2026 19:03:33 -0500
JAB <here@is.invalid> wrote:

On Sat, 04 Apr 2026 07:38:25 -0500, JAB <here@is.invalid> wrote:

Why Returning From Mars ls Impossible - Feynman's Warning
Physics with Feynman

This is due to the exponential nature of the Tsiolkovsky Rocket
Equation. To return from Mars, a rocket must carry not only the fuel
for the return leg but also the fuel required to transport that
"return fuel" from Earth to Mars in the first place. =============================================

Musk wants to go to the Moon now.....

I read somewhere, you can tell he's not serious because the only thing
he has any interest in is the 'let's build a rocket' part, not the
immense technological challenges inherent ot the entire rest of the
endeavor, from radiation exposure to terraforming to water production
and the rest of it. The rocket part is the only part he ever talks
about.

This is a very easily read and informative paper worth a look: https://www.nasa.gov/wp-content/uploads/2024/01/round-trip-mars-mission-mass-challenges.pdf?emrc=c0d7c4

Note the section of the trip where the sun is in between earth and
mars, rendering communication extremely difficult. Heck of a challenge.

Here's a piece on the incredible radiation exposure travelers would receive. https://nasaspacenews.com/2024/03/mars-mission-a-one-way-ticket-for-now/
Posted elsewhere
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From Newsgroup: sci.misc

On Mon, 6 Apr 2026 06:35:32 -0600, Retrograde
<fungus@amongus.com.invalid> wrote:

The rocket part is the only part he ever talks
about.

Before Space X, he tried to have the Russians send a rocket to Mars,
for what reason, I don't know. When he found out how much it was
going to cost, he did the arithmetic, and founded SpaceX (Space
Exploration Technologies Corp.)
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