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As much difficult is to communicate with an alien civilization, so much difficult is to send these civilizations
a spaceship to Earth. There is no spaceship and any other thing that can run with the speed of light, either using
our known technology or using another technology. Natures laws don't permitt this.
Explanation
Let's suppose that there are one million civilizations and have the ability to spend
their money (that means energy ) , to send spaceships everywhere. To have one and only one possibility, of one
and only one visit , then these civilizations should send for 200 years, 1000 spaceships every day.
Conclusion no1:
If there was in the past such a possibility, this has nothing to do with 500 different spaceships and shapes.
Conclusion no2:
Some poeple say that they saw alien spaceships and they show also pictures. These pictures are jokes. There is
no evidence that a spaceship has visited Earth.
Conclusion no3:
Does UFO's exist ? Ufo's do exist. UFO means unidentified flying object. When we observ the sky and we see something flying, and we don't know what that is, then this is a flying object. We cannot know all the phainomenons in the sky. But for everything there is a logical explanation.
Conclusion no4.
It's more accepatable to believe that they have already visited us and they observe
us from anthropological and social point of view, than to believe that they visit us every day with different spaceships
each time.
Conclusion no5:
are we alone in space? After many years of scientific research we conclude that there is no evidence, but our astrophysical
logic tells that there is somewhere life. Not in our solar system. (Perhaps some microbs in the surface of Mars
and protozoa in the oceans of Europe, which is one of the moons of Zeus ) But in other solar systems.