But very interestingly, in the event that the Earth is about to be destroyed, it wouldn't matter that 50 years have passed between departure and arrival. Humanity can reach another star, hopefully with habitable planets, well within the lifespan of one generation, which is awesome! =)
I'm just wondering why it's important for atomic structures to contain protons. Hydrogen-3 has two neutrons and one proton. Could you have a particle with two or more neutrons held together by nothing but the strong nuclear force? Is the reason I don't know about this because such particles...