This remains an unanswered question.
There is skimpy evidence suggesting the possibility of alien visitors to Earth. Much of this already sketchy evidence is obfuscated by wild speculation and scientific sounding drivel.
See related links for a sampling of some of these stories.
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This is a most magical topic. Researching it will take you down back alleys and diversions across the massive span of what might appear to be wackiness and hijinkiness mixed with science and rationality.
When I punched in "aliens on earth" into my favoured search engine, and you can do this with Google if you want, the first link that appeared (TruTV in the related links below) resulted in a 13 page slideshow of evidence that aliens have visited our planet. Here's a sampling of this result, which I encourage you to review and enjoy at your leisure:
1) 10,000 BC - while exploring caves in the Himalayas, an archaeologist and his students found small tombs which contained the skeletons of a number of 4'4" beings. The archaeologist, Dr. Tsum Um, analysed stones (the Dropa Stones) which told a story of a group called the Dropas which crashed on Earth. They were killed by local tribes due to their inhuman appearance.
2) 3,000 BC - Ancient texts dating back to 3,000 BCE described "Vimnas", flying machines that soared through the air and in space. They were said to be used as vehicles for Hindu gods and are here speculated as vehicles for extraterrestrials.
3) 1,180 AD - The Japanese government conducted an investigation into sightings of what they called "earthenware vessels" (flying saucers) which left behind them a glowing trail of smoke. The government stated it was the wind making the stars sway, which may have been one of the first alien coverups in human history.
4) 1,794 AD - More recently, the skeletal remains of Napolean Bonaparte were examined, and inside was found an object resembling a microchip. It was supposed that Napolean was abducted by aliens and implanted with the device.
5) 2,011 AD - What appeared to be a decayed and damaged body was found partly buried in Siberia's frozen tundra. It looked nothing like any Earth creature known at the time.
This is just the tip of the iceberg. I'd also recommend checking into some of David Icke's stuff (his last name is pronounced "ike", not "ick"), with both an open mind and a hefty grain of salt, as he speaks often of reptilian extraterrestrials (possibly the Anunnaki) having controlled and manipulated the human race for thousands of years, and even having ultimate control over the Vatican (which controls the thirteen families that have managed our planet's finances, politics and technological capabilities).
Like I said - back alleys and diversions. Enjoy your trip through this alternate dimension!
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aliens dont exist
There is no proof that aliens exist. I believe there is no such thing as aliens. Has anyone seen an alien ship? Has anyone seen an alien? No.
There is no solid proof aliens even exist much less have visited Earth.
aliens doesn't exist its just an imagination of scientists really i dont believe in these things
There have been many people who claim to have witnessed both UFOs and aliens, however there is no proof available to the general public. If proof does indeed exist, it is held as confidential information by the government.
no aliens are from other planets (whether they exist or not) and jinns are spirits on earth.
its not that u are cray if u think aliens exist ,if someone says the exist and someone says they dont exist , just respect there answers
no
Maybe, maybe not
Since we don't know about any aliens, there is really no way to know.
There is no reason to think so. So far, there is no actual hard evidence that aliens actually exist.
No they will not, the bible makes no mention of aliens, so there are no aliens.