If anyone were to actually sit down and learn a bit about our universe, it is simply impossible for earth to have the only life in the known universe. The entire universe, according to the big bang theory, is comprised of the same elemental group.
We are an infinitely small solar system in an infinitely large universe.
Our Milky Way alone (our particular galaxy) contains about 100-200 billion stars or "suns" -- each of which may or may not have planets of some sort in orbit. The Milky Way is approximately 100,000 light years across -- enormous by any stretch.
There are a guesstimate of approximately 100-200 billion galaxies in the "known" universe. We don't have the telescopes to know for certain. It is probably a whole lot more than that.
So, in summary, there are 100-200 billion times 100-200 billion stars or "suns" in the known universe... It is absolutely certain by any statistical measure that there are many, many planets out there that are of a similar elemental structure of the Earth along with proximity to a sun providing similar temperature variances.
They (whetever "they" is) are out there. It is certain. The question is, have any of "them" figured out a way around Einstein's theory of relativity and how it pertains to traveling the speed of light (or faster than the speed of light). Without the ability to travel 1,10,100,1000x the speed of light, there really isn't any way to travel to another system unless the "people" on board the spacecraft were immortal.
All religion aside, if Evolution is correct along with the approximate age of our universe, it is a bold statement to assume there is another race of beings that has evolved so much faster than Humans that they have not only figured out time travel (of which it would have to be called if one were to travel faster than light) and are implementing it to explore the universe. I don't buy that part... I suspect in another 100,000 years or so we may get past the whole "general relativity" issue, but I don't believe for one second that aliens have made their way to earth.
Food for thought.
I hate trolls.
Systems I currently own: 360, PS3, Wii, DS Lite (2)
Systems I've owned: PS2, PS1, Dreamcast, Saturn, 3DO, Genesis, Gamecube, N64, SNES, NES, GBA, GB, C64, Amiga, Atari 2600 and 5200, Sega Game Gear, Vectrex, Intellivision, Pong. Yes, Pong.
