I’m wondering if interstellar travel is possible. So I guess the starting point is figuring out FTL travel.
In: 1302
the secret is time dilation. The speed of light is constant for all observers no matter what speed they are moving at. So if you speed up to a significant proportion of the speed of light, time ACTUALLY slows down for you (and length starts to contract). How much time slows down is relative to how fast you go, so if you were to get really really close to light speed and waved, everyone else in the universe would see you waving very very slowly.
Here is a good series and visual intuition for it. https://www.youtube.com/watch?v=1rLWVZVWfdY&list=PLoaVOjvkzQtyjhV55wZcdicAz5KexgKvm
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