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Suppose those aliens we cut up during that alien autopsy thing were the last living aliens in the cosmos and we done kilt 'em.
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Now how is it that all the aliens could be dead?
1) Perhaps all civilizations mature to a certain point and then
annihilate themselves via religious fundamentalism, nuclear war,
biological war, destroying their planets ecosystem or creating one more
devices that ruptures, ruins or renders uninhabitable the local space
time continuum.
2) Suppose that whenever a civilization advances to a certain point the
landlord comes to collect the rent. The rent might be immortal souls,
DNA, water, life of all kinds, brainz (for the space alien zombies), or
anything the loss of which renders a civilization unviable.
3) The cosmic bullies shows up. The cosmic bullies might hate all
forms or life that are not their form of life. The cosmic bully might
hate any form of life that could be a rival.
4) It generally takes so long for sentient life to get to the space
faring stage that by the time they have done it one of the various
cosmic ticket alarm clocks have gone off. For instance, they took so
long to get smart that their sun, in the course of it's normal evolution
exploded. Or anyone of a number of chance events such as collisions
with meteor, asteroids, other planets, other suns other galaxy has time
to occur. Or something that the sentient life does not understand until
it's too late. Such as maybe the proton is stable until you build ten
or more particle accelerators of the trillion electron volt class and
then all matter as you know decays instantaneously. Or maybe when you
build artificial electrical generators of sufficient density on your
planet all the dark matter in the galaxy is suddenly attracted to your
planet--that's gotta hurt.
Whatever the cause, some scientists say the reason why normal rational
people who haven't been molesting farm animals and had to come up with
semi plausible excuse as to what was going on, have not seen space
aliens is maybe there aren't any. Maybe they are all dead.
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- Photo credit: wiredforlego via Foter.com / CC BY-SA
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