20 Amazing Facts About Universe Which No One Knows 

1. The universe has been expanding for 13.8 billion years

2. There are more than 400 billion galaxies in the observable universe

3. The age of the universe is 13.7 billion years old

4. The universe has been expanding for about 14 billion years

5. The universe is expanding at an accelerating rate and will continue to do so for the foreseeable future

6. There are more than 50 billion planets in our Milky Way galaxy alone

7. The Milky Way contains 100 thousand million stars, which is equal to a hundred thousand million galaxies with 100 thousand million stars each

8. Our Sun is one of over 100 billion other stars in our galaxy, the Milky Way

9. The earth is made up of about 5% oxygen, 97% nitrogen, and 1% other elements.

10. The sun is an average-size star and has a mass of about 2.5 million times that of our sun, or 150 billion tons.

11. Galaxies are huge groups of stars and gas clouds, held together by gravity, which rotate in all different directions and speeds.

12. The universe is expanding—that's why we can see it expanding all around us!

13. The universe is so big that light takes billions of years to reach us from the most distant objects in space. That's why we see stars as they were billions of years ago!

14. There are more than 100 billion galaxies in the universe!

15. Even though the universe is 13.7 billion years old, scientists think it formed just a few thousand years after the big bang!

16. Scientists think that black holes may be made up of very tiny particles called quarks and gluons (the building blocks for matter). These particles can combine together to form other types of matter like planets and stars!

17. The farthest object known to science is 12.7 billion light-years away from Earth. That's how long it would take for the light from that object to reach us if we were to travel at the speed of light.

18. There are more than 33 million million million (33 trillion) stars in our Milky Way Galaxy alone! That's more than there are grains of sand on all of Earth's beaches combined!

19. Approximately 70% of all galaxies have a black hole at their center—that means only 30% don't! Why? Because black holes suck up everything around them, including stars and planets. If your planet happened to be near a black hole when it got sucked into its gravity well, then bye-bye planet!

20. We need special cloths to go to space.