Are we alone in the universe?

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Has the earth ever been visited by extraterrestrials. If this has occurred it would have probably been before humans existed. Their technology would be way advanced. I believe that microbal life is common place in the Milky Way galaxy and nearly every other galaxy but complex life much more rare. Even so I think there are possiblily millions of advanced civilisations out there possibly a few even in our own galaxy.

The science adviser to president Eisenhower said "either we are alone in the universe, or we are not alone in the universe. Either way its mind boggling."

It took earth three billion years to get form bacteria to ameobas ( primitive microbes to advanced microbes). Then a billion years later came the Cambrian explosion when we vaulted from advanced microbes to sponges and jellyfish. So even among the tiny percentage of solar systems that have life probably only one in a hundred get beyond the bacteria stage.

But its a big universe out there with a hundred billion stars to a galaxy. So even with such huge odds against any life, against mulicellular life, and againt intelligent life evolving at any one location- the odds are that there must be life, complex life, and even intelligent life out there. But even if there maybe advanced civilizations beyond earth- and there could be thousands or more even in our own galaxy, the odds are that they are extremely far apart and unable to contact each other.

the building blocks of life have been found many places across the observable universe, though all discoveries i know of only exist in deep space nebulae, making life a bit unfeasible there, but since star systems are made from nebulae it does sound promising considering how many goldielock planets we keep finding every tear.

how to probe them for life is another matter entirely.

The answer to this question is not known. It can only be speculated. It would be foolish to strictly believe we were the only life in this Universe. Yet it would also be foolish to immediately accept that there is complex, extraterrestrial life which I have not found one piece of irrefutable evidence.

Yet you have to wonder. We have one life form on our planet that can survive the vacuum of space. The Water Bear

If I had to bet if there was life or if there was not on other planets then I would bet there is life.

Maybe. Earth is a deceptively comfortable place; most of the universe is too hellish for life to thrive. But I can imagine replicator molecules forming on many planets, and from that, life, of some form.

Being abit of a science geek I know the theory is there but getting actual evidence is the hard bit. It is impossible to reach the speed of light because this would take all the energy in the universe to accelerate a spacecraft. If a spacecraft could go into hyperspace, the speed of light becomes much higher, less fuel is needed and when it goes back into normal space it would have travelled alot further. It would be possible for aliens who have very long life expectancies to travel across the cosmos at much lower speed say 10% of the speed of life with very advanced technology. It was thought impossible for man to go to the moon but it was achieved so best to keep an open mind. You want proof. I can't give you proof but why do subatomic particle travel in time. They can suddenly pop into existance and then disappear again. There is prove of faster than light communication. It involves a particle anti-particle pair. One particle travels of in one direction and the other in another direction. If you do something to particle "a" then particle "b" immediately does the same thing instantaneously. I don't believe or disbelieve that aliens have visited Earth in the past but have said that I believe it is possible. If I had a valid facts on this then I'd probably receive a noble prize.

Anyone who says that we are alone in the universe is a total moron. Look at all that space. It's ridiculous.

[youtube]http://www.youtube.com/watch?v=17jymDn0W6U[/youtube]