Gravity (2013): Two Stations, Zero Chance
Gravity won seven Oscars, including Best Director, and its opening shot, a single continuous take in apparent zero-g, is genuinely stunning filmmaking. The science, though, required some creative geography. Sandra Bullock's character floats from the Hubble Space Telescope to the International Space Station and then to a Chinese space station, treating all three as though they were parked in the same neighbourhood. They are not. Hubble orbits at roughly 590 kilometres above Earth, the ISS at around 400 kilometres, and the two orbit at different inclinations. Getting from one to the other without a rocket burn would be physically impossible. The film also shows debris from a destroyed satellite circling the planet every 90 minutes and wiping out everything in low Earth orbit, the orbital mechanics of that debris cloud are a mess, because objects at different altitudes and inclinations do not conveniently sweep the same path on the same schedule. Director Alfonso Cuarón has said he knew about the inaccuracies and chose story over science. Fair enough. But physicist Neil deGrasse Tyson famously listed the film's errors on Twitter in real time during its release, and the list was long.
Armageddon (1998): NASA Uses This Film as a Training Exercise in What Not to Do
NASA's own scientists reportedly identified 168 scientific inaccuracies in Armageddon. The agency has since used the film in management training, employees watch it and have to spot as many errors as possible. The central premise is that a team of oil drillers will fly to a Texas-sized asteroid, drill 800 feet into its surface, and detonate a nuclear bomb to split it in two. The physics problem starts immediately. An asteroid the size of Texas would have enough mass that a nuclear detonation at 800 feet would be a mild inconvenience. To actually deflect or destroy an object that size, you would need to begin the intervention years in advance, not the 18 days the film gives you. The shuttle sequences are equally creative: the spacecraft dodge asteroid chunks like fighter jets, which requires an atmosphere to generate the aerodynamic forces that make such manoeuvres possible. Space has no atmosphere. The chunks would travel in straight lines.
The Martian (2015): The Storm That Could Not Have Happened
The Martian is widely, and correctly, praised for its science. Andy Weir researched the novel obsessively, and the film adaptation gets a remarkable amount right, the radiation exposure, the caloric math of growing potatoes, the communication delays between Earth and Mars. The one error that matters most to the plot is also the most fundamental. The story begins when a massive Martian dust storm forces the crew to abort their mission, and a piece of debris strikes and apparently kills Mark Watney. Mars has an atmosphere, but it is about 0.6 percent as dense as Earth's. A wind moving at 100 kilometres per hour on Mars would exert roughly the same force as a 10 kilometre per hour breeze on Earth. It could not knock over an antenna. It could not throw debris with enough force to injure anyone. Weir has acknowledged this openly, he knew the storm was wrong, but the story needed a mechanism to strand Watney, and a Martian breeze that barely rustles a flag was not going to do it.
Interstellar (2014): The Wave Planet Makes No Sense
Interstellar hired theoretical physicist Kip Thorne as a consultant, and the film's rendering of Gargantua, the black hole, is the most scientifically accurate depiction of one ever put on screen. The accretion disc's appearance was based on actual equations, and the result was so novel that Thorne co-authored a scientific paper about it. Then there is the water planet. Miller's planet sits so close to Gargantua that one hour there equals seven years on Earth, the time dilation is real physics, applied correctly. The problem is that a planet that close to a black hole of that mass would be subjected to tidal forces so extreme that liquid water, let alone a standing wave the height of a skyscraper, would be the least of anyone's problems. The planet would be geologically destroyed. The crew would be spaghettified before they landed. The film earns enormous credit for what it got right, which makes the wave sequence, played completely straight, the more jarring for anyone who has done the maths.
Ad Astra (2019): Moon Pirates and a Very Fast Neptune
Ad Astra is a quieter film than the others on this list, and it presents itself with a documentary seriousness that makes its errors land harder. Brad Pitt's character travels to the Moon, which in the film's near future has become a contested territory where rovers get ambushed by pirates. The Moon has no atmosphere. There is no cover, no dust cloud to hide in, no medium through which sound could carry. A pirate ambush on the lunar surface would be conducted in total silence, with no concealment, against anyone with a line of sight. The film also gets Neptune wrong in a way that is harder to forgive. The journey from Earth to Neptune is treated as a matter of weeks. Neptune is, at its closest, about 4.3 billion kilometres from Earth. The fastest spacecraft ever launched, Voyager 1, took about 12 years to reach that distance. No propulsion system shown in Ad Astra would close that gap in weeks. The film needed the trip to feel manageable. The solar system did not cooperate.
What these five films share is not laziness, the teams behind Gravity, Interstellar, and The Martian clearly cared about getting things right. The errors are almost always load-bearing: the Martian storm that strands Watney, the orbital geography that lets Bullock reach three stations, the Neptune timeline that makes the plot possible. Hollywood science goes wrong at exactly the point where the science would have prevented the story from happening at all. The physics was never the obstacle. The story was.
