Do you believe in aliens?

Yes, I do. I think it's very ignorant for humans not to. Think about it this way: We live in a Universe with many mysteries. There are countless of galaxies and in them are a infinite amount of stars, nebulas, clusters and so on. Some of the stars are part of system much like our Solar System and often what orbits around those very stars are planets. In Nebula, some contain mainly planets hence "Planetary Nebula". Each planet holds an untold world filled with life. Our Planet, Earth, is 4.54 Billion years old. For the time of other things:
(3.6 billion years of simple cells (prokaryotes),
3.4 billion years of stromatolites demonstrating photosynthesis,
2 billion years of complex cells (eukaryotes),
1 billion years of multicellular life,
600 million years of simple animals,
570 million years of arthropods (ancestors of insects, arachnids and crustaceans),
550 million years of complex animals,
500 million years of fish and proto-amphibians,
475 million years of land plants,
400 million years of insects and seeds,
360 million years of amphibians,
300 million years of reptiles,
200 million years of mammals,
150 million years of birds,
130 million years of flowers,
65 million years since the dinosaurs died out,
2.5 million years since the appearance of the genus Homo,
200,000 years of anatomically modern humans,
25,000 years since the disappearance of Neanderthal traits from the fossil record.
13,000 years since the disappearance of Homo floresiensis from the fossil record)

There are over 7+ billion humans on earth and despite all this there are still many things on our planet that remain mysteries. Which goes back to my point about the universe, whose to say that there aren't lifeforms on other planets? Whose to say that there aren't other forms of energy, resources, vegetation and so on, that's yet to have been discovered by humans but it's all found on another planet? What makes Humans so special that they have the gull to believe that they are the only forms of intelligent life in this vast universe we live in?

Think about all those theories that talk of Multiverses (Parallel Universes), String Theory that's extremely complicated but predicts that there are around 11 different dimensions, Dark Matter, etc. Whose to say that some of these aren't actually true? Sure, we can say that it's all nonsense but who are we to say these things if they are yet to be proven?

There is countless evidence of the existence of Aliens that dates from the most ancient form of earth to the now, the modern times. There have been frequent sightings and so on. Remember when I talked about the mysteries of our planet? Think of the Pyramids, Atlantis and Lumeria, the Nazca Lines, Crop Circles, Abductions, Cave art and so on. Do you think that all of this evidence is somehow a hoax or do you refuse to acknowledge these things, think of them as being insignificant and not worthy of your precious time?

Well, think again. The Universe doesn't work that way. Could there possibly be any one thing that is more important than the other? Whose to say that the inhabitants of this Universe aren't connected and somehow equal?

It's allot to think about... but THINK you must.