1. The name of the black hole in the center of our Milky Way is ...
2. If you know both the actual brightness of an object and its apparent brightness from your location then with no other information you can estimate:
3. What is true about the rotation of a solid disk?
4. Previous IAAC rounds featured Proxima/Alpha Centauri as closes star(system) to the Earth. Which one is the second closest star(system)?
5. Which statement about an atom is not true:
