Do you think that beings from another planet have been on Earth?
918263
They have been and will be... meteors and other foreign objects entered earth have some microbes in it. Some would survived along the way if they could withstand the burning heat as they hit the earth's atmosphere.
13099
I DONT THINK THAT WE R  ALONE . WE HAVE SEEN A FEW SIGNS OF XTRA TERRESTRIAL LIFE AND IT  IS POSSIBLE THAT THERE ARE OTHER LIVING ORGANISMS INHABITED PLANETS
479915
Creatures from beyond Earth!
327734
I don't know about experiments and alien visits. But I know that I'd like to think that there is more out there some where. I don't even know if there is a chance that other intelegent life exists for not but I can't help but think that other planets in the universe have to be suitable for some form of life and continue to sustain something. We may never find it or know about it, especailly in this life time but there has to be more than just Earth.
570127
or maybe the aleins want to explore our planet becoz as the aleins r scary and new to us\njust like tht we r new and scary to them.\n\nso,the aleins explore our planet becoz they might be thinking which planet is this??????round just like ours but has life and has something blue blue (which is water)\nand land on it. \nand humans,planets and animals etc\nright?\ni think so.and maybe they would have explored other planets too but they didnt find anything interesting like our planet which is funny to them.\nmaybe they r scared of us tht we might kill them.\n\nthe aliens go to their planet after collecting information frm ours and try to spread to other planets and so the other aleins come and visit our planet.\n\nther can be soooo many reasons for this question.\nand these r some few.\nlets see wht others say about it.
408320
Very niave!  We have been shown that there are other living organisms on other planets that we have have snet out to study.  Just because they are not in human or (our) peoples form does not mean that the planet is not alive. We have also been shown to where some planets have shown previous life on them.
328025
Absolutely! The odds that they exist are overwhelming when you think of how GALAXIES are scattered like specks of dust!\nNow... even though aliens exist, what are the odds that they are on another planet in our galaxy right NOW? Think about it... It took 50 million years for humans to appear on Earth. How long will we be here?... only 50 to 100 thousand years (hopefully)? How many other planets will bring forth intelligent life - not a whole heck of a lot. And of them, when will that life be around? Just a tiny amount of relative time.\n...What I am saying is that EVEN IF other civilizations were, are, or will be... the timeline of the universe is too insanely long for any of us to be co-existing. The reality may very well be that we are currently very alone here in our time and place. I hope this gives you a new, more realistic way of seeing things. Sorry it's such a downer, though!
36493
Extra-Terrestrials\nALIENS
384439
No, because of modern culture we always tend to think that aliens are much more advanced then us, but we are very advanced are selves, and to even find another planet close to us with equal or similar intelligence would be a miracle. Finding a planet with enough resources and intelligence to make it over here would be almost impossible. The closest thing we have found to life else where is micro organisms, we haven't even found a planet that would be inhabitable by any advanced animal.
1054859
if ur asking if we, as humans, can be sure the no one else exists on the other planets? then no..no one can be so sure, but the facts gathered about the other planets, such as chemicals in the air, etc... can tell something about the planets..
925011
yeah\nwe're aliens to some other planet millions of miles away\nheyyyyyyyyy its snowing!!!!!!!!!!!!!!!!!!!!!!
604795
If you are talking about space aliens or aliens from another planet, there are not any.\nNo aliens have been found that are extraterrestrial.\n\nIf you just want a story, click links below.
1127838
True. My exgirlfriend was an alien. She said she was from a different planet. \nBelieve her she was!
362363
There is, sadly, no evidence of aliens.  I'd love to encounter visitors from another planet (of the peaceful variety, at least, I'm not looking forward to a real-life game of Space Invaders!), but there don't seem to be any.  Maybe we all smell funny.\n\nThe evidence against the so-called alien encounter stories is pretty telling.  Look up "spleep paralysis" for an explanation that covers the "alien abductions".\n\nBut, while I don't beleive earth is being visited, that doesn't mean I believe it isn't happening, just that the people who say they are meeting aliens seem to be wrong.  If aliens are here, they're being very quiet, observing us like biologists behind blinds.\n\nLife seems pretty easy to develop in the right circumstances.  I expect the universe will be full of life, though most of it will be of the bacterial level of complexity, getting no further.  I would be surprised if there weren't other intelligences out there somewhere, though.  It just doesn't seem that difficult to evolve.  Still, I don't know and I won't pretend I do.  Here's hoping!\n\nAs my father says, either there's life out there or there isn't.  Either way, it's amazing.
1123723
I have heard the voices and captured them. I talk with these spirits. They were on our Earth as humans at one point and we should treat them as such.
1126911
I believe there is life other than on Earth. Even if just mathematically!\nAn interesting point though, is that the authorities on this field have concluded that the nearest system that COULD support life is Sirius. That's interesting, because throughout history, the more believable tales of alien contact seem to all point to that star system. The Dogon tribe are a classic example of that. They apparently knew of Sirius A and its two companions(Sirius B and Sirius C) long before any 'civilised' society. Sirius C has yet to be discovered, but could well be there! I quote from Wikipedia: "Apparent orbital irregularities in Sirius B have been observed since 1894, suggesting a third very small companion star, but this has never been definitely confirmed." \n\nAs to us being Parasites on this Living Planet, I couldn't agree more.
27853
Since there are so many planets out there, and we only know so much about our own solar system, and then there are all these OTHER solar systems out there, it would be almost silly to presume Earth is the only one w/ life.  But are there aliens out there that look like Hollywood aliens?  that's probably going to remain an open question!