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if anti-matter exists, then maybe, just maybe, in some way, space travel could be possible. colliding anti-matter and matter together would release an IMMENSE amount of energy (180 petajoules, according to wikipedia. 1 petajoule is 277,777,777,777.78 wH). this makes me think that space travel being hard may not be the solution for fermi paradox.
if we successfully and safely transition to getting artificial super intelligence, i’m pretty sure that space travel will become possible. and if it would be possible for us, what says that it won’t be possible for extra-terrestrial life?
but then again, we haven’t really seen any aliens till now..