Based on eye-witness accounts, and putting aside any tech level considerations (they are more advanced because of time, not inate skill) then so far I think we're onto a winner.
Well untill they got with real proof most or even all "withness account are fake" I estimate the chance of been visited very small. Like 2 %. Why always grey small aliens because they are populair in the crowd so the people who are addicted to attention go for that.
The majority of rednecks appear to report the classic Gray alien; childishly small with large heads and frail bodies. The rest of the reports say mainly very human in appearance, although again a bit pale and thin looking, and only one or two talk about something more like a Wookie.
Some people fantasy are restricted, they hear something and take that over. But there are exceptions. Because of the consistenty of reports it make the chance more higher that it's real. But then again the first once are already known and other take that over as there fake report.
Physically therefore, I think we can kick their ass. Mentally? Who can tell. We have a lot of practice smacking our own neighbours around, so beating up aliens should cause no qualms at all. We can get pretty riled up and organised when faced with a severe enough threat, it just might take a little time.
Well it would make sense in the middle ages where people killed each other by force or way better cavemen. Where Physical strengt is important for mostly handcombat. We now kill each other with decent tech level where a child can pull a trigger putting a hollow point in a muscle man. And take him out. We have had arms race feeded by the cold war. And war's before.
If aliens come they would be much more advance or explored space much longer then we do. And if hostile they would be very prepared like Hitler germany and Japan would be in begin off WW2 taken mostly all neighbours offgard. Like a walk in the park. GB due to it Island like isolation and the far away USA where a problem. Our weapon tech is based on fellow earth lings not to defent us agians alien invasion from high orbit. The aliens would have a extreem high ground ideal for bombardment. The first year they are better equiped till we adopt our weaponairy to this specific treat. If they didn't manage to kick our asses so hard we could not overcome.
I think our biggest problem would come from a completely alien lifeform, something insectoid perhaps. Unlikely, but a hive mind might develop and we'd be dead meat then. Very hardy, physically strong, unemotional, fast growing and not giving a damn about us at all. We wouldn't stand a chance.
Could be but if agressive alien would be weak they could go for excoskeleton. To a level they would be superiur to a stonger species. A technology also explored on earth. Also if 5.56 NAto is not suficient to stop this stronger aliens people forces adopt. Like .408 or .50 Bulpup anti alien assault rifles. The first fase of war would be a big problem but would adopt. Even alien tech get exposed to us. A arms race of a much higher level will start if there is some tech level difference.
Personally I'd love to see us discover that there are dozens of advanced species running around, and they land and clue us in on our position in the galaxy. Just watching the various religious heads trying to explain it and rewrite their myths to suit the news would be brilliant.
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