I think aliens exist but not in our solar system.
there is no way of telling what they might look like.
the most likly planet to contain life so far would be gliese 581 d, it is a planet that scientists calculated as being in the habitable zone (not too close to the sun, not too far away either) they have sent a message there which will arrive in 2029 and the earliest time for a response would be 2049, although I don't think we will get a response evan if there is inteligent life ther, they are currently working on a new satalite that may be able to see the planet and determine its outer atmosphere, from that they can determine weather or not something is breathing down and if something is breathing it's alive.
so the discovery of alien life might actually be in our lifetimes.
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