Azuren said:
Flilix said:
I think there's very little we can be 100% sure of. I'd even argue that there isn't anything at all.
As unlikely as the existence of unicorns is, what about them would make them impossible? You didn't define 'magic', but it is technically possible that there are animals (whether they live on our planet or not) that have abilities that contradict our current scientific beliefs.
Scientists have proven that it's impossible to go faster than the speed of light. So unless the aliens are able to travel for thousands, maybe millions of years, it's not possible for them to reach us according to our scientific system.
Although everything is technically possible, we should not consider the possibility of all of these things. The chances of them being true are just way to small. Another example: my bed can suddenly start attacking me (because of reasons that I cannot understand, since I don't know absolutely everything that there is to know about our universe), but that doesn't mean that I need to be afraid of my bed (since I know enough about our universe to safely assume that the chances of this happening are extremely low).
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Actually, it's impossible to reach the speed of light. One form of theoretical warp drive involves displacement at the exact point of light speed, allowing for a vessel to exit that displacement at FTL speeds.
Then there's the other type of warp drive that utilizes worm holes. No, you're not traveling faster than the speed of light, but you are traveling light-years at a time.
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There's also an interesting space bending theory doing the rounds to potentially go ftl. Our race are dreamers! 
https://en.m.wikipedia.org/wiki/Alcubierre_drive
