Earth

In orbit for longer and longer periods of time, we need to solve not only inorganic resupply problems such as food, water, oxygen and propellant, but also the various problems faced by astronauts flying in orbit for long periods of time

In the Arctic Siberian region, there is a huge crater called "the mouth of hell"

If humans evolved from the forest archaeopteryx, how did the forest archaeopteryx emerge?

The legendary prehistoric civilization is not the only one "Atlantis", then this mysterious "yellow brick road" could be the remains of some other prehistoric civilization left behind?

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

Do UFOs exist?

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

In this 5.5 million-year-old cave, not only is there no sunlight, but the environment is also very harsh

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.

The modern Earth's atmosphere is so rich in oxygen that the vast majority of this hydrogen will be re-oxidized to water without escaping from the Earth's top atmosphere