One definition of an alien is a foreign national living in a country. As such anyone not a citizen of the country where they are living is an alien.
If you are referring to extraterrestrial aliens then there is no evidence that they exist, let alone live on earth.
An extraterrestrial life form is any form of life that did not evolve on Earth. That includes plant life, micro organisms, animals from other planets, and, possibly even some forms of life that have evolved out in space.
So far, Earth is the only planet we know that supports life. We have no evidence that any life exists elsewhere. However, recent discoveries of microorganisms that exist in extreme conditions on Earth have scientists suspecting that such organisms may exist on other planets and the search is ongoing.
The honest answer is that nobody knows. None has been found so far, but that doesn't really mean that there isn't any, since we humans have not been able to closely investigate many planets yet.
People say yes and some say no. In my thoughts i got to say yes why u may ask your self. Wills look at it like this the government has or still has area 51 one of the most top secert militery bases in the united states no one knows what went or still goes on inside its close doors. People say they have seen strange lights have come from Area 51 and the government like always says its nothing thats why i belive they have already landed here on earth.
Our brains are not great enough to understand the universe, aliens etc. Just think of it this way, we don't know where we came from and we don't know where we are going, we can only hope we find out after we die, this may be good, bad or nothing at all or even worse then we can imagine, if death was so good why do we all fear it?
yes the have back in the times when we belived in witches and all that stuff they were making lights in the sky and wariors thauht they were sighs of victory but it was only them making fun of us at least the probly were making fun of us
At the moment - there is NO evidence of other life in the Universe.
Dozens of compelling claims come out every year that seem to suggest the existence of life on planets other than our own. And yet even when they come from the government itself, these bits of evidence get lost in the shuffle of the ongoing UFO debate. Imagine for a moment Earth had discovered evidence of life on Mars, SETI had received signals that seemed to be of intelligent origin, and even hostile environments such as Venus seemed to be brimming with life according to data collected by NASA space probes. It may surprise you to learn all three are still being debated in the highest tiers of the scientific community.
By now most of us have heard of the Mars Asteroid ALH84001 which was said to possess signs of alien life, but was later refuted and thought to have come from a more terrestrial origin in a debate that lives on even today. But did you know when the Mars Lander made its way to the red planet in 1976 it found chemical evidence suggesting those same microbes that would be discovered later might have been present in a large portion of Martian soil. Why was it dismissed? Despite the positive results, which scientists couldn't explain, no specific examples of a Martian microbe was discovered. Later it was speculated that ALH84001 contained life that may not have been picked up by these same tests.
You've probably also heard of the 'Wow' signal picked up by the SETI program. The incredibly loud signal was picked up by an Ohio University radio telescope. The signal was well outside of traditional radio frequencies used on Earth and was so strong that the researcher recording the data wrote "Wow!" in the margins as the printer spat out the readings. Why was the signal dismissed? The explanation given by skeptics essentially meant that nothing SETI could find would be considered proof of alien life unless it specifically contained a message indicating such an origin. But did you know that SETI would also receive a message on three separate occasions from the same area of space in 2004? The signal was dismissed using largely the same premise.
But perhaps strangest of all were the signs of life found on overwhelmingly hostile planets such as Jupiter and Venus. Venus should, by all known models of the planet's composition, be emitting vast amounts of carbon dioxide, and yet it isn't. The only explanation for this is a microbe that would collect the carbon dioxide and convert it into other more common elements on the planet's surface. Though the planet's surface is incredibly hot and uninhabitable for life as we know it, in the upper atmosphere it is actually quite cool and moist being an ideal location for creatures even existing on Earth. Why was it dismissed? If the planet's atmosphere were so cool, it would need to find a way to stay up there without being pulled back to the planet's surface by gravity. And while it's unknown how such a creature could survive, scientists studying old data have suggested it's not beyond the realm of possibility and could explain quite a bit about its atmospheric composition.
So if even one of these surprisingly likely and compelling theories were to carry with them an element of truth suggesting extraterrestrial presence elsewhere in the universe we would be able to begin creating a model by which life on other planets could have evolved to a more technologically advanced form. But is it possible they could already have done the same and actually reached for the stars to find us?
No. Based on everything humanity knows to be true about space, time, and energy, it would be impossible for an alien race to travel to earth from even the nearest star known to have planets.
Even at light speed, the journey would take thousands of years. Speeds slower? Millions of years to billions of years to never. But that's purely hypothetical, because the energy needed to accelerate a single atom to light speed is infinite; if one could convert the entire universe to pure energy, it still could not be done. They just could not ever get here. And, if they somehow hypothetically set out a billion years ago, living hundreds of millions of generations on board a space vessel just for the purpose of visiting earth... what? Why would such a thing be done? A billion years ago, there wouldn't have been a very interesting earth to visit; in fact, the aliens may have been asking, "Could there ever be any life on Earth?"
To even consider such a thing, one would have to believe that the current physical laws of the universe are completely in error. And there is no reason to suspect that.
There is no absolute, universally accepted, proof that aliens have come to earth.
There is no scientific evidence that aliens have ever visited the earth. Though there are many people that believe it may be so.
Some farmers may refer to them as Brood Cows.
wait till the cows come home'?
Cattleman or cattlewoman. Not farmer because not all farmers have cows, and it wouldn't be "producer" either because we're talking about someone who works with cows, not owns them.
For Sanitation purposes prior to milking the cow.
pretty much every country that has farmers.!!
No. Bulls impregnate "Earth-Cows" which are Earth-bound as well.
Then you snap their legs and laugh at them
A farmer went to check his stock and all cows were missing. Then he saw the below space craft with Lightdrive in low gear. Too late. Refer to below space craft picture.
No.
The cows will be an alien cow.
farmers
calcium
Farmers
The cows are maybe too weak to care for or the farmer wants the meat. dead cows rawk !!
Yes.
Farmers and ranchers often feed the cows. However cows are able to feed themselves when they're out grazing on pasture.
Some farmers may refer to them as Brood Cows.