@SoulDivine
I agree that UFO in general is of course exist. However, they
may only be space debris or military secret weapon or some natural
phenomenon.
However, I do not see how the mere fact that we possess a
certain level technology justifies the conclusion that there are
other creatures outside of our galaxy to possess a more advanced
level technology. Their existence is also questionable since we
have practically have no evidence of their existence (well, you
mention that there are lots of evidence, however they are highly
contentious).
Now, what about the idea that since we have spaceships that is
able to travel to other planets mean there is good possibility that
there are other advanced civilization out there is capable to do
so.
First, I think it is pretty well established that there is no
advanced form of life form within our solar system.
Second, so far there have been many claims of habitable planets
out there in other galaxies, however they are hardly habitable in
the Earth sense (some have water, but extremely cold), (some have
right temperature, but wrong pressure and all sort of things).
However, they are so far away that it may take much longer time for
them to travel here.
Third, there is a physical limit on how fast we can travel
(which is speed of light).
Fourth such speed is impossible to reach by famous equation
E=MC^2/(1-v^2/c^2), since energy required will reach infinity. Even
if we reach the 99.9% of speed of light, the energy required is
ridiculously high. To move 60kg being requires 5.38 x 10^21 J of
energy. (We spent 4.74 x10^20 a year in 2008).
Fifth, momentum is mxv, travelling at the speed of 99.9% of
speed of light will ensure collision with even a pebble the size of
pinky will ensure damage equivalent to several megatons of TNT
exploded.
Thus, I think it is impossible for UFO to be alien spaceship or
the like.
wah sibei chim , i don;t understand , can simplify a not?
haha
