Five natural images that scientists still cannot explain

Animal migration Many animals migrate far away from their original residence Thousands or even tens of thousands of kilometers away, they flew over mountains and crossed oceans without using GPS devices (Global Positioning System). Why didn't they get lost? Although there are many theories to explain this phenomenon, the real cause is still unknown.

The phenomenon of dragon spitting fire occurs every year in the Mekong River in Thailand Above, hundreds of fireballs rise. The fireballs set off here are by no means man-made, but a natural phenomenon, known as "the dragon spitting fire." Every year during the Buddhist Lent period in late autumn, you can witness this spectacle on a full moon night. Fireballs of various sizes rise from the river from time to time and disappear every few seconds.

Earthquake light Earthquake lightMost of the time it is a white or bluish flash, which occurs before a major earthquake and usually lasts for a few seconds. According to records from the U.S. Geological Survey, seismic lights occur infrequently, perhaps once every few hundred years.

The Origin of the Universe Current scientific evidence supports the Big Bang theory. Scientists generally believe that the Big Bang occurred about 13 billion years ago. However, humans have never reached a consensus on how and why the Big Bang occurred.

The Tunguska Explosion In June 1908, a fireball suddenly exploded on the banks of the Tunguska River in the Siberian forest of Russia. The ground shook violently and instantly flattened 1,994 square kilometers of forest. The energy released by the explosion reached 15 megatons, which was 1,000 times more powerful than the Hiroshima atomic bomb. But what surprised countless people was that there were neither craters nor traces of meteorites at the explosion site.