1. Divide the class in half and make two teams A and B. Each
team will have 100 points in the beginning.
2. Each member of team A thinks of an answer to a possible question
concerning astronomy. One member of team A will repeat his answer
twice. Team B has 30 seconds to formulate an appropriate question
for the answer.
3. If team B can devise an acceptable question for the answer,
Team A loses 2 points. If team B cannot, it loses 2 points. Each
member on team A should have one turn to give answers before team
B's opportunity to give answers.
4. When one team has a score of zero the game has ended.