Where did Earth's water originate?

Related questions

1. Is there a magnetic field on the moon?
2. Can the Moon have an atmosphere?
3. What are the most common gases in Earth's atmosphere?
4. How does Earth's atmosphere protect life on Earth?
5. Why living things can survive on the earth?
6. Why do we need our atmosphere?
7. Do humans produce methane?
8. What are the 5 types of atmosphere?
9. Who invented atmosphere?
10. Why is the ozone layer important?

Tags

1. #neptunian
2. #outer
3. #earth
4. #objects
5. #trans
6. #brought
7. #water
8. #sources
9. #world
10. #protoplanets
11. #oceans
12. #meteoroids
13. #asteroid
14. #reaches
15. #extraplanetary
16. #colliding
17. #comets