If they are warmongering, they would probably wipe us out - since their technology would be far superior. If they were to be peaceful they may just observe us. they may even be walking among us now. I might even be one (you never know).
Impossible to predict. It would depend on what sort of aliens these were, and why they came here. Science Fiction writers have imagined hundreds of possible results from The Twilight Zone's classic horror episode "To Serve Man" (spoiler: "It's a COOKBOOK!") to Isaac Asimov's more humorous story "Buy Jupiter", to the more martial "invasion from space" scenarios like the movie "Independence Day" and the Niven & Pournelle classic SF novel "Footfall".
One thing is certain; it would answer the questions "Are we alone in the universe" and "Is star travel possible" in a very graphic way.
what do you think is going to destroy the world in 2012?
We won't know until we can all see them.
So...one theory is that cells came to Earth from comets or from aliens seeding the planet...the operative term is theory.
it would blow up!
they will loose electrons
It would take you apprxamently 12,740 km to get through.
No one knows.
Is there any reason to think that aliens are all cereal killers?
Uh... No.
Aliens are more advanced then us if they came to earth but if they found out to late that the only way to kill them is to shoot them in Head then it is a fair fight.
I dont think it is likely to happen.
It would get to hot. We would die.
Depends if they can cloak their ships or if they can use stealth or not. Etc etc.
If you find something that looks alien, it is more than likely going to be fake. Aliens have never landed on earth and people on started seeing UFOs and aliens in the 1950s when Sci-fi came out introuducing the possibility of aliens however all recorded alien finds have been proved as fake.
No, it is not true that Martians are aliens. The term "Martian" refers to beings or things that come from or are associated with the planet Mars. While the possibility of life existing on Mars is still being explored, there is no confirmed evidence of aliens or extraterrestrial life on Mars or any other planet.
We won't know until we can all see them.
Both animals came to earth from aliens.
I would hope we would try to greet them as friends until proven otherwise. The fact is that if aliens have the technology to come to earth, I don't think we would have much hope of winning a war with them.