Aliens do exist but.....
I'm not sure they exist the way we know them. Space is so big to make the probabilities of their existence more than one can imagine. By aliens i do not mean the green guys with large eyes n two antennas sticking out of their head. Any organism that runs on some energy, so called a life form.

Even if aliens really exist we might not be sure if they are civilized enough to reach us. Consider them civilized and advanced in technology, still we may not be sure they can reach us due to the vastness of space. The only way might be through a worm hole which as of now is away from our reach.The alien proofs we have don't seem convincing enough but still can implant a thought in our mind. A thought that can run deep into your mind causing a lot of questions.
Searching answers a deeper revelation dawns. This is not new to us.
Artists of our history try to convey something through their works below. They merge their imaginations with some facts. Facts that are common and..... see for yourself..
Tanzania - 27,000 BC
This painting is located in Itolo and depicts several disc shaped objects.
Sego Canyon, Utah - 5,500 BC
This image is an cave painting found in Utha. The painting contains some strange beings with antennas in their heads with large eyes.
Australia - 3,000 BC
Wandjina petroglyphs from Kimberley, Australia. Do i need to tell what they look like ?
329 BC - Central Asia
Alexander the Great records two great silver shields, spitting fire around the rims in the sky that dived repeatedly at his army as they were attempting a river crossing. The action so panicked his elephants, horses, and men they had to abandon the river crossing until the following day
India-China BC
Kosovo, Yugoslavia - 1350 A.D
Frescos throughout Europe which reveal the appearance of space ships in the skies including this painting of 'The Crucifixion' - painted in 1350. It seems to depict a small human looking man looking over his shoulder - at another UFO as if in pursuit - as he flies across the sky in what is clearly a space ship. The leading craft is decorated with two twinkling stars, one reminiscent of national insignia on modern aircraft. This painting hangs above the altar at the Visoki Decani Monestary in Kosovo, Yugoslavia.
Europe 15 th Century
This painting is called "The Madonna with Saint Giovannino". It was painted in the 15th century by Domenico Ghirlandaio (1449-1494) and hangs as part of the Loeser collection in the Palazzo Vecchio. Above Mary's right shoulder is a disk shaped object. Below is a blow up of this section and a man and his dog can clearly be seen looking up at the object.
This is a tapestry called Summer's Triumph It was created in Bruges in 1538 and presently resides at the Bayerisches National Museum. You can clearly see several disc shaped objects in the top of the tapestry.
Other Paintings from the same time.
Most of these depicts UFOs as lenticular clouds.
UFO sighting over in 1566 - Basel, Switzerland
A 16th century woodcutting depicts this scene in which dark spheres were witnessed hovering over the town of Basel, Switzerland in 1566. The spheres appeared at sunrise, 'Many became red and fiery, ending by being consumed and vanishing', wrote Samuel Coccius in the local newspaper on this date.
Edmund Halley, discoverer of Halley's Comet, 1676, United Kingdom
Edmund Halley, the astronomer who discovered Haley's comet, could recall two accounts involving unidentified crafts. His first experience was in March of 1676, when he saw a, as he said, "Vast body apparently bigger than the moon."
After this period you can find more of these things. When we entered 20 the century the percent of ufo sightings ran up. Out there on the internet you can find a lot of photos and videos convincing enough. But most are fake. The governments of many nations like US, China, Russia, India etc know something about these extra terrestrials. It is believed that there are alien bases in India-China border, far side of the moon, Area 51 etc. Speaking about aliens is isn't about UFOs alone. Alien abduction has played a considerable role in the last century. Putting these to gather there is something that is hidden from us. What is it ?
Really something more than what meets the eye.. isn't it..