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Anyone who knows about physics will tell you this:
The idea of Aliens traveling from outer space to Earth is very slim. BUT if they could, they would have to travel at close to the speed of light to do it.
When you start talking about speeds like the speed of light (c) then you have to know the work Einstein did and what his theories (which have since been proven) state.
As you approach the speed of light your length contracts and your mass increases. Soo if there was a car that was 20 ft long and a garage that was stationary and only 10 feet long. That car, if it was traveling close enough to the speed of light, could go into the garage, and both doors could close at the same time. This is because the actual length of the car changes.
The same holds true for mass, as your speed increases and starts going towards any fraction of the speed of light (like 1% of the speed of light and this is noticeable) then whatever object it is gets more massive. Light can go the speed of light because a photon has no mass. Everything else is limited by that.
IF Aliens found a way to skip physics and do something where the speed of light wouldn't be a limiting factor, it would also mean that there would be no limit on the size of their spacecraft. So why would they come around in a tiny little flying saucer? It wouldn't need to be aerodynamic, and it could be as big as the Starship Enterprise! There would be no point in sending out tiny little drone ships when you can send out fully equipped battle/eco dome cruisers.
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