I think it would end badly for the aliens. Didn’t you hear the news?
Breaking news. Astrophysicists have discovered a new planet within the “Goldilocks” region orbiting a yellow dwarf star and believe it is teaming with life, thus putting to rest the age-old question: “Is there life on other planets?”
The planet appears to be similar to our own in size and has an atmosphere primarily of oxygen and nitrogen. However, don’t plan on visiting the new world anytime soon. Not only is it many light years away, but microbial life floating in the wind would be a death trap without a spacesuit since we have never developed evolutionary immunity against them.
Observations suggest the surface of the planet is mostly submerged under salt-water oceans which themselves are full of aquatic life of all sizes. The areas that rise above the oceans, approximately 25% of the planet surface, are covered with plant life which provide food for many of the animals that live there.
Evidence indicates the dry land areas are inhabited mainly by germs and insects, however quadrupeds and bipeds live among them. The bipeds appear to be polluting their own air and water due to advanced industrial revolution. Great cities have arisen all over the land and the bipeds appear to have launched satellites and probes into space. Unfortunately, they quarrel and kill each other and share no common interests with their environment.
The planet is located inside the neighboring Milky Way Galaxy, which can be seen from our own Andromeda Galaxy with the naked eye in the night sky, and appears brilliant when seen through even modest telescopes.
Tentatively the planet, has been named “Earth” and due to the circumstances may be barren of all life within a few thousand years. It has been classified as dangerous for habitation and the search for intelligent life on other worlds continues.