Are Aliens Actually Highly Evolved Dinosaurs?

Modern man has apparently only been in existence for the last 100,000 years. We have managed to accomplish a lot of things in this time. For example, the pyramids, the wheel, agriculture, the car and space travel to name but a few. In such a short amount of time in evolutionary terms, we have come a long way.

The dinosaurs inhabited the Earth for 185 million years. Considering we, as modern humans have inhabited the planet for only 100,000 years, I leads me to believe that the dinosaurs should have evolved into intelligent beings similar to us. It is only in the last 150 years that we as  a species have had a technological boom. I believe that the dinosaurs started off as a primitive species just like we did, (think of the ape like humanoids that walked the Earth before us), but then a certain species of dinosaur evolved enough to rival our intellect of today's standards, if not succeed it.

This is strictly an out-there theory, but I wonder whether one species of dinosaur evolved so much that they possessed the ability to navigate the globe artificially like us build vast structures and have the ability of space travel. Maybe, the human like dinosaurs that did evolve knew of the approaching destruction that was heading for Earth and took their culture and society into the cosmos. Perhaps the aliens we know of today are actually the evolved species of dinosaurs that left the Earth 65 million years ago. Maybe they are coming back to visit their home world and investigating it's new inhabitants. Like I say, it's just a theory.