Ganska trogen, men med några anmärkningsvärda skillnader.
Efter att ha läst boken och sett filmen kan jag säga att det är en ganska trogen anpassning. De viktigaste skillnaderna jag märkte är:
The novel starts after Watney has been abandoned, and does not explain exactly how and why he was left on Mars until over 100 pages into the novel. The film, on the other hand, starts off almost immediately with the dust storm that forces the evacuation.
Venkat Kapoor is named "Vincent Kapoor" in the film.
The book has more concerning the deal with the Chinese space program. (It is less well-received in the novel than in the film.)
The relationship between Beck and Johannsen is known to the Hermes crew in the novel (Lewis knows and reveals it to everyone), but it is kept secret in the film.
The journey from the HAB to the MAV is not shown in the film, but described in great detail in the novel (and there is a setback along the way involving a crater).
The space rescue is much more dramatic in the film (e.g. Watney pokes a hole into his suit to use the escaping oxygen as thrust).
The (latest eBook / audio book version of the) novel ends immediately after the rescue, but the film shows Watney teaching cadets and also reveals some of what the other members of the crew are doing with their lives, post-rescue.
Generally speaking, the novel devotes more time and energy to explaining the science behind Watney's actions and innovations.
Skäl till skillnader:
Direktör Ridley Scott har inte kommenterat om förändringarna var långa eller dramatiska / videografiska skäl. Man kan tänka sig att motivationen var lite av båda:
Cutting down on the scientific explanations helps with length — i.e. trying to squeeze a nearly 400-page book into 140 minutes — and with making the film appeal to a broad audience (not everyone wants to hear scientific details, unfortunately). Cutting down on the negotiations with the Chinese space agency and on Watney's journey from the HAB to the MAV also help with the length.
Watney's "Iron Man" stunt during the rescue (i.e. using his suit's oxygen supply as thrust) makes for good drama.
Du kan hitta intressant denna artikel om de allmänna skillnaderna i tonen mellan romanen och filmen:
- Vox - Hur Ridley Scott hjälpte Martianen för att bryta förbannelsen av Mars-filmen
Slutligen har Scott varit mycket nyligen utmanade om varför han bestämde sig för att ändra raserna med två tecken (se andra och tredje spoiler-taggar ovan), men han har ännu inte kommenterat detta officiellt.