Is Alien Exist?

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Last night i watch tv and see a program that discussing about alien, ET, etc. i feel that show was ridiculous cause they discussing about something that they can`t prove. but i see they are very serious when talking about it. i don`t know but it seems interesting for me, weird but instead interesting. in your opinion, is such a things like alien, ET, big foot exist? ps: don`t take this discussion to seriously okay...