Some say alien life forms have visited Earth throughout history. However, such claims are difficult to prove. Most UFO sightings and abductions are easy to dismiss as hoaxes or simple misunderstandings.
But what about the times when the little green men actually leave something behind? Or the artifacts people from ancient times have constructed to honor what could only be visitors from other planets? There are many strange objects in the world, both enigmatic and man-made, that are said to be proof of alien life.
10. The Russian UFO Tooth Wheel
A Russian man found a strange piece of machinery from Vladivostok, the administrative capital of the Primorsky Krai area. The object resembled a piece of tooth wheel and was embedded in a piece of coal he was using to light a fire. Although discarded pieces of old machines are not uncommon in Russia, the man became curious and showed his find to some scientists. Testing revealed that the toothed object was almost pure aluminum and almost certainly artificially made.
Also, it was 300 million years old. This raised some interesting questions, as aluminum of this purity and shape can’t form naturally and humans didn’t figure out how to make it until 1825. Curiously, the object also resembles parts that are used in microscopes and other delicate technical devices.
Although conspiracy theorists have been quick to declare the find a part of an alien spaceship, the scientists researching it are not willing to jump to conclusions and wish to run further tests in order to learn more about the mysterious artifact.