Yes, absent unambiguous evidence, i don't believe anyone's claim (i.e., your claim) that astronauts have seen "extraterrestrial objects" in orbit around this planet. (EDIT: How would they know what they thought they saw was extra-terrestrial--did they get out of their capsule and check?) People who think aliens go diddybopping around the the cosmos are truly bereft of an understanding of the distances and the cost--in absolute terms of materials and energy--necessary for that kind of travel. The unintentionally naïve Fermi Paradox makes the assumption that sufficiently, technologically advanced civilizations would, as a matter of course, go out to colonize other worlds. Fermi then asked, where are they? Fermi ignored or was ignorant of the effects of micro-gravity and the need for shielding from cosmic radiation. I suspect though, that it was just a throw-away line on Fermi's part. Those who claim, however, that just because other technologically sophisticated cultures may
exist, they will have visited this planet truly display a profound ignorance of the material and energy cost of long-distance travel in a galaxy in which long distances are measure in dozens, hundreds or even thousands of light years.