My personal requirement for "hard sci-fi" is that the movie give a reasonable explanation for the problems that arise in it. First give the axioms and then deduce the conclusions, which allows everyone to face some minor scientific errors without losing the logical integrity, which is the case with Inception.
This film is not hard science fiction under this requirement, because it does not give a relatively reasonable explanation for the cooling of the sun, nor does it give a reasonable explanation for the explosion to restart the sun.
Below I mention a few obvious mistakes.
1: The sun is getting colder.
People are used to thinking of the sun as a kind of fuel that burns continuously and will run out one day, like a bonfire, so it will get cold - from the support of existing theory and statistics, on the contrary, since the birth of the sun, it Constantly heating up, this will continue until the end of the main sequence star phase.
The cooling of main-sequence stars generally only occurs in supermassive (tens or even hundreds of solar-mass stars, such as Pistol stars), because the stellar wind is extremely violent and the stellar mass will decrease rapidly. Mass reduction is pretty much the only way to cool down - there's always enough fuel.
2: Fission restarts the star.
The sun converts 6 million tons of matter into energy every second. Not to mention that the efficiency of fusion is higher than that of fission, even if the entire spacecraft, including nuclear fuel, is converted into energy, it is not enough for a fraction of the sun's lasting 1s. This is a matter of order of magnitude. How could fission explosions create new stars? This is a matter of order of magnitude.
3: The power of sunlight.
Even if the sun hadn't gotten colder, in the orbit near Mercury where the first captain sacrificed, the sun's light intensity was about 8 times that of the earth. That kind of instant tanning of steel and swallowing people into a sea of fire was a fantasy. The highest temperature on the surface of Mercury is less than 500 ℃, and the steel is instantly sun-dried to thousands of degrees.
4: People are instantly frostbitten in outer space.
I don't know if you have experienced the difference between 80°C and 80°C hot water in a sauna. Why can one stay for a while while the other dare not touch it? media problem.
Outer space is almost a vacuum, and the biggest threat to people without radiation is not the extremely cold temperature, but the air pressure. (The video here says that -273°C is also a big problem. The universe has 3k background radiation. It is speculated that it may be the residual temperature of the big bang. Except for extremely high-speed expanding tissues and laboratories, it is difficult to be lower than -270°C) Because there is no medium contact , the heat transfer is carried out by electromagnetic radiation, and it is impossible to frostbite for a while.
There are still some small issues not to mention. After reading these, do you still think this is hard science fiction?
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