5 great mysteries of the universe

The vast universe contains many miraculous and mysterious things. It is always an interesting topic for people to continue to explore and conquer.

The great mysteries of the universe have not been answered

1. Where does the galaxy come from

Scientists believe that galaxies formed about 13 billion years ago , not only randomly distributed in the universe but also forming clusters of galaxies. According to the Big Bang theory, the universe initially had a very high density and began to expand rapidly. Small gas clouds combine together by gravity, then they condense to form galaxies.

The four planets of the star system Gliese 581 include GJ 581g - the planet has liquid water on the surface.(Photo: NASA)

2. Is there life like Earth elsewhere

Researchers believe that there are many planets in the universe that are similar to Earth, for example the planet GJ 581g has liquid water on the surface. However, whether or not these planets exist is still a question.

3. Dark matter

Dark matter is one of the greatest puzzles of the universe. In 1990, researchers discovered the universe was expanding and thought dark matter was the cause of the phenomenon. Dark energy accounts for about 70% of the cosmic energy density. So far, the way this energy source works is still mysterious and waiting for people to explore.

4. Alien life is closer than we thought

Researchers are debating the possibility of life in galaxies many years from light. Meanwhile, some comments identify ancient ruins on the Moon as evidence for life that once existed on Earth's natural satellites.

5. Where is the white hole?

Through mathematics, Albert Einstein once proved the existence of white holes. It sprayed matter out in large quantities instead of sucking it all inside like a black hole. Currently, the scientific community has not yet determined the location of the white hole as an object in the universe.