I believe their are things out there we can not perceive in our dimension.
What Tick saw may have been an experiment, it may not have either. Whom says aliens are exactly in our image, futurama paints a great picture of how many alien forms there can be possible, if they are out there.
Many ancient cultures have humanoid beings they pray too, or are deities, beings they highly respect.
You have to look at accounts from before technology. Those from the people that observed the sky.