The Martian - Movie - The bubble

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Discussion Overview

The discussion revolves around the physics and decisions made in the movie "The Martian," specifically regarding the choice to cut a hole in the rover and construct a plastic foil bubble on top. Participants explore the implications of this decision within the context of the film's narrative and its technical feasibility.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants question the rationale behind cutting a hole in the rover and covering it with a plastic foil bubble, suggesting it may not have been necessary.
  • Others propose that the modification was needed to accommodate essential equipment, as indicated in the book, which states that the rover was not large enough to hold all necessary components without structural changes.
  • There is a suggestion that the film's portrayal may differ from the book, leading to confusion about the necessity of the modifications.
  • One participant notes that the tent allowed the character to stand up without wearing a space suit, implying a design choice for comfort within the confined space of the rover.
  • Concerns are raised about the potential risks of creating a hole in the rover's hull, especially given the thin atmosphere on Mars.
  • Some participants express frustration over the lack of clarity regarding the decision to alter the rover's structure, indicating a desire for more explanation within the film.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and implications of cutting a hole in the rover. While some reference the book to support the modifications, others remain skeptical about the decision and its portrayal in the film. The discussion does not reach a consensus.

Contextual Notes

Participants reference the differences between the book and the movie, noting that the book provides more context for the decisions made regarding the rover's modifications. There are also mentions of filmmaking choices that may have influenced the depiction of these technical aspects.

Omega0
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Hi,
I love the movie "The Marsian". I did not start reading the book (I'll do soon).
What do you think about discussing the physics?
I am wondering why the NASA in the end suggested to cut a hole in the rover and to build that plastic foil bubble on top.
There must be a really good reason to try to hold around dp=1bar with a foil...
Any ideas?
 
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Did you see an alternative?
 
Simon Bridge said:
Did you see an alternative?
Why not to leave it as it was? Shielded without destroying the hull? I really missed the point, sorry...
 
Omega0 said:
Why not to leave it as it was? Shielded without destroying the hull? I really missed the point, sorry...
Is it simply to warm in the day and okay in the night to calm the body down?
 
Simon Bridge said:
Did you see an alternative?

Sure. Colonize Antarctica instead.
 
The hole and tent above it was so that Mark could stand up in the rover, to stretch his legs without getting into his space suit. It gave the illusion of space in an area the size of Chevrolet Cruze.

And the book is free online, google for it. It's much better than the movie because he has time to explain what's going on. You only get about 15% of the book from the movie.
 
Take off the forward part of the shuttle, and seal it with the canvas, that was the most strange to me.
How could they think seriously, that it won't cause trouble, even if the air is thin??
 
  • #10
The question asked was: "why ... cut a hole in the rover and ... build that plastic foil bubble on top?"
The answer off the link, quoting the book, is:

"I need to modify the rover to carry the Atmospheric Regulator, Oxygenator, and Water Reclaimer. I call them “The Big Three”. All three need to be in the pressurized area, but the rover isn't big enough. [...] I'll have to make structural changes to that trailer. And by “structural changes” I mean “cut a big hole in the hull.” Then I can move the Big Three in and use Hab canvas to loosely cover the hole. It'll balloon out when I pressurize the rover, but it'll hold."

Notice how this explicitly talks about the hole.
ie. He makes the modifications because the rover is not big enough otherwise.
The link also discusses how the movie did this part badly. Ie. In the book there are two rovers and one gets used as a trailer.
Omega0 said:
Why not to leave it as it was? Shielded without destroying the hull? I really missed the point, sorry...
As the above quote makes clear, there was not enough room as it was.
The link discusses the way the film fails at this part though ... so it was likely that there was also a filmaking decision behind the on-screen result.
 
Last edited:
  • #11
That hole was in the side of the rover, IIRC. The script writer put it on the roof because that was a convenient flat spot. In the book Mark didn't have a crane so he'd be unlike to chose the roof as the entry point. I also remember that the tent was attached so he could go into it from the rover without wearing his suit. A roof installation for that would have been ... awkward.
 

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