Although many strange things have been unearthed in modern times, some of them may be caused by the variation of animals and plants caused by some external factors, or they may have formed fossils in the stratum after a long time. Some unearthed skulls may belong to some wild animals, but people outside have never seen them because of the scarcity of species or in the deep mountains and forests. Later, with the passage of time, the external environment changed. Not suitable for their survival, and then extinct. Just like dinosaurs, they gradually died out with the volcanic eruption. It was discovered by later generations because of the later crustal movement.
Didn't the aliens who passed each other in the early years also spread the fire at that time? Many people want to know whether there are aliens. There are also many areas where humans claim to have seen aliens, saying that aliens are relatively small, extremely ugly, with very big eyes, no ears and small faces, just like awl faces. When it looks uglier than humans. Some people say that alien weapons are more advanced and high-tech technology is more advanced. At that time, it was widely rumored that if aliens attacked earthlings, earthlings would definitely lose.
As time goes by, the legend of aliens has faded away, but there are still some curious people studying whether the future really exists. I don't know yet. With the present technology, you can't find it.