Factual error: The surviving space shuttle takes off from the asteroid horizontally, like an airliner taking off from a runway. This is absurd. There is no air to provide lift for the wings, so the shuttle - with its engines providing thrust straight back - would simply trundle along the ground like a car. It doesn't use its maneuvering jets at any time, and they are far too feeble to lift the weight of the shuttle anyway. Nor do they gimbal the main engine, which would lift the shuttle vertically on an axis through the centre of the engine - they swoop gracefully into the air after a long take off. Second, they'd have to count on finding a clear length of ground on a debris strewn asteroid. Vertical takeoff, anyone?
Factual error: En route to the asteroid, the two space shuttles head to the Russian space station to refuel. To simulate gravity, the cosmonaut aboard the space station fires a few rockets to put the space station into the spin. How fast does it need to spin to reproduce Earth gravity? Assuming the space station's spoke arms (where the shuttles dock) are about 50 feet long, the answer is 8 revolutions a minute. That makes it impossible to dock - it'd be like trying to drive a car on ice-covered roads into a spinning parking garage. There's another, more fundamental, problem: the artificial gravity points in the wrong direction. Think of spinning rides at the amusement park. The spinning motion creates an artificial gravity, an effective outward-pushing force. On the space station, the spinning would tend to throw the astronauts down the station's spoke arms and back onto the shuttle. Also, the artificial gravity would taper off to nothing at the centre. But the movie's artificial gravity somehow points down, not outward, and appears to work equally well throughout the station.
Continuity mistake: After Sharpe and Stamper have the argument on the asteroid, Truman says they need the radio back up. When he says this, you see the countdown clock for the asteroid which is at five hours and 12 minutes. A bit later in the film, after the nuke was shut down by a technician at NASA, one of the Air Force Sergeants takes the terminal. In the background, you can see the clock again but the time on it is at six hours and 49 minutes. (01:37:00 - 01:42:50)
Factual error: In the Russian space station, A.J. and Lev are running to the Independence shuttle. But as the space station is falling apart, a piece of it crashes into the other end of the hallway they are currently running through. There is no way they would make it to the shuttle even with it being a few feet away; they'd get sucked out into space almost immediately.
Continuity mistake: At the end of the movie, after the asteroid explodes, we see Grace looking through the glass and there are reflections of NASA controllers cheering. The same shot was used earlier in the film to depict Grace looking upset at some bad news. The camera zoomed into the picture a bit, but you can still see one controller cheering.
Factual error: It's explained in detail how the impact will cause a horrible freak tide, what it will do, and that one half of mankind will die in the nuclear winter. That's absolutely irrelevant. The asteroid is "the size of Texas," that means a quarter of a million square miles. Such an impact is called ELE (Extinction Level Event). A bigger part of the Pacific Ocean would evaporate immediately, so no matter if a wave or not. The earth would become "sterilized." So no lifeform will live long enough to die in a winter. (So it is nonsensical to compare that impact with the event 65 million years ago. It's much different).
Factual error: The idea of two spacecraft blasting off together so close to each other at the same time is a joke. One would put the other at great risk. Not only is there massive fire and heat, but the vibrations from the noise of the exhaust do great damage to the surroundings. And there is great inconsistency about just how close the two spacecraft really are. The first still shot taken in the dark has them at different towers about 150 yards apart. But, then all the men take an elevator up ONE tower and are split apart into the two groups at the top of the tower. Furthermore, the launch takes place at Kennedy Space Center Launch Complex 39: the fixed and rotating service structures built for the Space Shuttle are visible. The pads at LC 39 are 8,700 feet apart (just over 1.5 miles). (01:00:00)
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