human
What are the most common questions about astronomy?
assistant
1. How did the universe begin?
2. What is the speed of light?
3. What is a black hole?
4. How do we know that dark matter exists?
5. Why is the sky blue?
6. How do you calculate the distance to a star?
7. What is the difference between a supernova and a nova?
8. What is the name of the asteroid belt between Mars and Jupiter?
9. What is the best way to observe the night sky?
10. What is the oldest object in the universe?