4th grade wants to know... about the Earth or the Solar System

1. How many people live in the Earth?
2. What is the atmosphere made of?
3. How were the planets made?
4. Why is there gravity on this planet and not on other planets?
5. What is the blackhole that is closest to the Earth?
6. How was life created on Earth?
7. How can an astronaut return to the Earth through the atmosphere?
8. Why are the planets not together? Why don´t they crash?
9. What was the Earth like before life? How do we know?
10. How was the Earth created?
11. How much water is on Earth?
12. What is the Milky Way?
13. Why is the Sun called the Sun and the stars just stars if they are the same?
14. How did man discover other planets?
15. What are shooting stars?
16. How hot is the sun?
17. What was the first planet to exist?
18. How are black holes created?
19. What is inside a black hole?
20. How hot is the stratosphere?
21. Do aliens exist?
22. How big is the atmosphere?
23. What is in the center of the sun?
24. How far is the earth from the Milky Way?
25. Why is Uranus the coldest planet?