C. (5 points) As of now, astronomers have discovered only two "visitors" to the Solar System, that is, bodies that came from outside the Solar System and then left or are on their way out of the system. Do some research on them:
1. What are their names?
2. How we know these bodies were "visitors"?
3. Are the bodies similar or different? How are they similar or different?
4. There have been some interesting theories about one of them. Describe one such theory and explain whether you believe that theory and why.