Ty
Elio Addict
Survey Drones...Hoth "I didn't hit it that hard. It must have had a self-destruct..."Current estimates put the number of planets in the Milky Way galaxy at 100 Billion. That's 100,000,000,000. So, if we assume that there are 1000 spacefaring alien races in the galaxy, and that each one can visit one planet per day, it would still take 273,972 years to visit them all.
If anything, my bet is that all of these UFOs people see are unmanned survey drones. Otherwise, charting the galaxy would take FOREVER.