Earth

Do UFOs exist?

Dinosaurs left a fascinating chapter in the evolution of life on earth, first appearing some 230 million years ago and "Ruling" The planet for 160 million years. To this day, there are numerous dinosaur fossils scattered around the world, still silently telling us of their former glory.

If we dig up all the sand in the Sahara Desert, then we can see the "bedrock" of this desert

The earth's water resistance comes from the high temperature, pressure and density of its interior

The seven stars in a row are Saturn, Neptune, Jupiter, Mars, Uranus, Venus and Mercury in the solar system.

Mount fuji, located in the south of honshu island in japan, is a famous active volcano, with an altitude of about 3,775 metres, and is the highest peak in japan, so it has a very important symbolic status in japan. From the viewpoint of its appearance, mount fuji is still quite different from many other mountains, and when viewed from afar, it looks like an upside down fan hanging in the air.

In general, when a spacecraft, probe or rocket wreckage re-enters the atmosphere, they are fast, reaching several kilometers per second or even faster

Since there are many lakes in China, many of them have the title of "largest".

The earth was born more than 4 billion years ago, when it was very different from the earth of today, one of which is that the environment of cosmic space is more different.

For humans, the universe is too dimensional for us to see the details of its depths for the time being