That there is life besides that on Earth? Give reasons why you believe so, and if you do believe so, do you think they will ever visit us?
2007-12-23 04:00:50 · 8 answers · asked by I <3 the Joker 3 in Science & Mathematics ➔ Astronomy & Space
Just sheer numbers...there are so many billions of stars in this galaxy, and billions, if not trillions, of galaxies beyond ours in this universe, I would find it difficult to believe that Earth would be the only place to develop life.
As for visitors from out there, I think it is possible, but maybe they have some sort of Prime Directive in coming in contact with us until humanity gets over its own pettiness.
2007-12-23 04:09:21 · answer #1 · answered by Shaula 7 · 3⤊ 1⤋
Theres probably life on almost every planet within its stars continuously habitable zone. Life started on Earth VERY quickly. The problem is that complex life, the eukaryotes, took an additional 3BY to evolve. From what we know (and its not all that much) the steps that were necessary for multicellular complex life to evolve are incredibly improbable. The events that had to occur for intelligent life to evolve are equally so. The odds against our being here are vanishingly low. If there are aliens where are they? The great physicist Enrico Fermi calculated that an advanced civilization should be able to colonize the galaxy in something over 5MY. If the Drake equation is to be taken seriously the galaxy should be swarming with intelligent civilizations, and lots of them should have been here by now. They aren't. There is absolutely no reasonable evidence for alien visits. SETI has found no intelligent signals. While its not proof, its a very good reason to suggest that they don't exist. We are the only intelligent life in the cosmos. And the way we're going there will likely be one fewer in the not too distant future.
2007-12-23 13:04:50 · answer #2 · answered by Anonymous · 1⤊ 1⤋
Yes.
Most will tell you because the universe is BIG. Well, that's true, but I'm gonna tell you how it's possible.
Do you realize how much water is just floating around on comets in the universe? Large quanities, mossive quanities.
It's already been proven that water exists in our own solar system. Scientists are going crazy about a moon called europa, they believe there is an ocean underneath a frozen sheet of ice.
If we're discovering potential canidates for water in are own solar system,as well as growing credibility to owning our existence to falling comets in the early days of our earth, then yes.
Will they visit us?
Sure, once they manage to find us, if we don't find them first.
It's a big place to look around in.
2007-12-23 13:54:49 · answer #3 · answered by Jansen J 4 · 2⤊ 1⤋
The Universe is endless, so it's hard to believe that Earth would be the only place to develop life. Visiting us? One day for sure!!!
2007-12-23 12:34:46 · answer #4 · answered by stdalmatinac 2 · 0⤊ 1⤋
Yes, the likelihood of the existence of extra-terrestrial life is as close as you can get to a statistical near-certainty.
The failure of SETI to detect extra-terrestrial intelligence does not alter the fact that they are probably out there. Technological civilizations are simply too far apart for their electromagnetic radiations to reach each other and be detectable above the background noise. And the inviolable limit of the speed of light means that we will never visit them, nor they us.
2007-12-23 12:25:11 · answer #5 · answered by MVB 6 · 0⤊ 1⤋
The vastness of the universe is mind boggling. There is no way of knowing. Mankind has always played with the idea of other forms of life existing out there somewhere. I have nothing to base a belief on, of life existing anywhere else.
2007-12-23 12:17:11 · answer #6 · answered by Anonymous · 0⤊ 1⤋
As a bit of a mis-quote from Carl Sagan...if life only existed on Earth, it would be an awful waste of space.
There just has to be other life out there,
2007-12-23 12:45:42 · answer #7 · answered by Anonymous · 2⤊ 1⤋
Why not if we exist why not other advanced or idiotic life forms exist
Like living bacteria in another planet still a "alien"
2007-12-23 12:11:42 · answer #8 · answered by ~ 3 · 1⤊ 0⤋