Note: Moderate spoiler, and the physical mechanism may be incorrectly explained, welcome to make a brick.
Q: Why did the male protagonist Matt so cute want to play with fire in the perch and almost blow up himself?
A: Playing with fire is to get water. In order to reduce the launch weight, NASA did not carry a lot of water to Mars. Instead, it uses a water circulation device to circulate and absorb water in air, sewage, garbage, and even excrement (so when Duan Meng takes everyone's poop to make fertilizer, the vacuum-packed poop is dried into powder), and the body itself has a net need for water Very little, so a small amount of water is enough to support the life of six astronauts for many days. Therefore, Daomeng takes water mainly to prepare for the establishment of a Mars farm.
Potatoes need a lot of water during the growth process, and the water storage in the habitat is far from enough.
As a result, water can only be made chemically, and a lot of liquid oxygen is stored in the warehouse, with sufficient oxygen but very little hydrogen. So Daomeng dismantled the remaining liao canisters in the launch frame and stole the hydrogen in the liao hydrazine. Use a catalyst to decompose hydrazine to obtain hydrogen, and then ignite the hydrogen to obtain water~ (Note: Hydrazine is poisonous, so
please don't reproduce it in this experiment) Q: Is the cuteness lacking oxygen in the habitat? Are potatoes grown for photosynthesis to get oxygen?
A: There is no lack of oxygen. First of all, there are several tanks of liquid oxygen stored in them, and they are still ignited to play~ In addition, the human body requires very little oxygen for breathing. There is an oxygenator in the habitat, which can decompose carbon dioxide and convert it into oxygen to reduce carbon dioxide. Concentration, so oxygen is recyclable. (Ninety-five percent of the Martian atmosphere is carbon dioxide, so it can be considered that there is a constant supply of oxygen)
Q: What is the biggest problem encountered by the Martian farm? Why did you sigh "Bacteria are dead" after the perch warehouse leaked?
A: If on other planets, carbon dioxide rather than water should be the scarcest thing in space farms, but this is on Mars, and carbon dioxide is the most indispensable. You can regularly collect the Martian atmosphere into the habitat to ensure that plants can grow normally. . But pay attention to the concentration can not be too high, the carbon dioxide concentration exceeds 1%, the human body will show signs of poisoning.
In addition, plants need to cooperate with bacteria in the soil during their growth. As a botanist, one of Daomeng's scientific research tasks is to mix the earth's soil with the Martian soil and test its activity, so the bacterial conditions can be guaranteed. In addition, there are sealed fresh potatoes in the refrigerator, it is planned that everyone can eat real food on Thanksgiving, so it coincidentally leaves the renewable tubers of high-yield crops for the sprouting!
However, during the explosion, the cold night Mars quickly plundered the air, water vapor, and heat in the habitat. The potatoes and bacteria spent more than 20 hours in a near vacuum environment of tens of degrees below zero, and they were all dead. , Mars Farm is also dead. (Later it was discovered that there were still bacteria remaining in the soil, and the vitality was really tenacious.)
Q: At the end, I unloaded the bow of the spacecraft and only covered it with a film. Will it not be rubbed and heated to melt it during launch?
A: As mentioned earlier, the Martian air is extremely thin, only one percent, and even sound waves are difficult to propagate in it (so the whistling wind in the film can actually only appear in the brain tonic), and the heat generated by friction is very small. And when the acceleration is large enough, the high-altitude Martian atmosphere is even negligible. Therefore, the convertible plan does not need to consider whether it can withstand friction.
Q: What is the slingshot effect? Why does the Hermes return to Mars soon by relying on the slingshot effect?
A: During the return journey, the Hermes does not enter the Earth's orbit, but adjusts its course to pass the earth, and then uses the earth's gravity to reverse speed and change its direction. In the process of shifting, gravity acts like a slingshot. The kinetic energy of the spacecraft is first transformed into gravitational potential energy, and then back to kinetic energy. In this process, energy is conserved and momentum is conserved (the change in momentum of the spacecraft is compensated by the earth, and this momentum is not worth mentioning relative to the mass of the earth). Gravity is so magical. Interested children’s shoes can search for “moon catching the small three”, which tells the story of how the moon used gravity to drive away the small near-Earth object J002E3 that was trying to become a new satellite of the earth.
Q: Why in the Hermes spacecraft, astronauts can sometimes shuttle freely like fish, and sometimes they seem to regain gravity and walk freely?
A: The reason for this is very simple. The former is of course because of weightlessness, and the latter is because the spacecraft is spinning in the middle, and the centripetal force simulates gravity. Of course, theoretically, when docking with the sun god, the spacecraft should stop spinning. It is not in the movie. It may be because the setting in the book is that the entire spacecraft is rotating around the central axis. In the movie, only the living and working warehouses are rotating, and the other parts are relatively static.
The following is the deletion and modification of the plot:
P1: In the book, the cuteness in the book accidentally short-circuited the spacecraft when transforming the Mars rover, and burned the Pathfinder, which relies on communication.
P2: While drove thousands of miles to the launch site, Duan Meng encountered a mild Martian dust storm on the way. The intensity of this dust storm is not strong, but it will reduce visibility and gradually reduce the output of solar cells until it is not enough to support driving. The dumb cute, who lost contact with NASA, didn't know it, and could only hope that he could look back suddenly before going too far into the center of the dust storm, and then walk around.
P3: When the Hermes was picked up, there was not much drama in the book, and the cuteness did not pierce him to become Iron Man. Commander Lewis did not temporarily replace Baker to go to the spacewalk to meet the cuteness. This is also not in compliance with the norms, because Baker is the preferred player after many trainings, and even if there is an accident, Vogel is Baker’s alternate, and it is not. commander.
P4: It is written in the book that Duan Meng returned to the Hermes and ended the volume. There was an extra section in the film, which was slightly redundant.
There are two little easter eggs in the movie, which are very interesting:
D1: Why is the meeting to decide whether to return the Hermes to be called the "Elrond Meeting"? It is explained in the movie that the allusion comes from the Lord of the Rings. Of course, this name is mainly used for confidentiality, and it also highlights that NASA is a nerd.
D2: When Ares 5 lifted off, Asian faces appeared when the astronauts encouraged each other. This should be regarded as a small easter egg that is not easy to find. In the book, one of the conditions for my big rabbit country to agree to provide Apollo thrusters is that Ares V must carry a Chinese astronaut. There is no plot in the movie, probably for sublimation (it is also possible that this section was deleted in the mainland release), but the scene at the end responds to this section slightly.
In fact, the most regrettable thing in the movie is that it didn't delete all kinds of funny complaints from the male protagonist, which is really disappointing. I suggest you read novels. The novels are wonderful and well translated, each worth five stars.
View more about The Martian reviews
