Do aliens exist(among us)? Hmm. This is a serious question. Since science is chiefly about tested and verifiable evidence, going by the apparent illustrative evidence you gave above, one is almost tempted to agree to the effect of their existence. However, taking a cue from the an example you gave above, where the space agents admittedly reported that they saw flying objects. Now, these guys only reported what they saw, while we back here on earth made our deductions. Yes some objects flew. But coul they have been aliens? What if they were just coagulated dust flying around?
Now, what i can see here is man trying to be curious cum adventurous. Man has always been this way. They could have been something else.
Great post!
coagulated dust will not change direction like that, you need to watch that video again. You have to understand that scientific discovery sometimes suffer from human limitations.