Unknown Discovery in Astronomy

Universe is crowded with innumerable unknown mysteries. Here is a short list unknown discovery:

1. How was the universe originated?
2. Is there existence of Higs Boson Particle? {Update: It has been discovered now}
3. Which particle is responsible for gravitational force?
4. Is there any human civilization in other parts of the universe?
5. Where is the space radiation come from?
6. How is the shape of the satellite of Uranus?