1.Time travel: Impossible. It requires that you travel faster than light and according to Einstein, there is nothing that can travel faster than light. Not to mention the amount of energy you need to get to the speed of light is … well, you will need an infinite supply of energy. Theoretically, wormholes can make that happen, but you would need something called negative energy to keep one of those bad boys open – and as far as anyone knows, there’s no such thing.
2.In space, no one can hear you scream: correct, they can’t. See, sound needs air to travel and there’s no air – and no light - in the vacuum of space. So, all those super-cool space ship fights in the movies would actually be pretty boring to watch in real life.
3.Humanoid and half-breed aliens: probably not accurate. Here’s why: Humans have evolved according to our environment and we should assume that life on other planets would evolve the same. So, the odds of the universe being stocked with “chesty, alien princesses who crave starship captains” is slim to none. Which brings us to half-breeds (human/alien offspring). Our DNA is too different for us to interbreed with other species on our own planet, much less an alien species. So, when you are watching, “Species 4 or 5 or 10” and they are making a baby from human/alien experiment … it’s highly impossible as there’s no guarantee that an alien species could have the same DNA encoding we do.
4.Laser bolts you can dodge: you can’t. Why? Because lasers are made of light and you can’t travel faster than the speed of light. So, unless whoever is pointing a laser gun at you is a poor shot, you’re getting hit. Boom. Let’s hope it’s set on stun.
5.Planetary gravity: not the same as on Earth. Different planets have different gravitational pulls. Here’s one aspect of the movie John Carter that was correct. When John Carter appeared on Mars, he had the ability to jump great distances and heights. That’s because while he weighed about 180 pounds on Earth, he would only weigh about 70 pounds there. It’s incredibly shortsighted to assume that every perceived, ‘habitable.’ planet will be just like Earth. That said:
6.What does every planet in ever science fiction movie have in common? You guess it. They all look like Earth. While that’s not impossible, just like alien species looking humanoid, it’s probably unlikely. Consider the planets in our own solar system – each has varying ecological areas depending on their atmospheric and weather patterns. Venus, considered Earth’s twin, is all desert, but we can’t live on it because the surface is hot enough to melt lead. So, we have to assume whatever life is on these other planets was born to and has evolved to be able to survive there. So, alien life probably wouldn’t survive on Earth in the event of an actual alien invasion. They probably wouldn’t be able to survive on our planet.
