When did the Space Shuttle Challenger explode?
Answer: 1986
Explanation:
The Space Shuttle Challenger disaster was a fatal accident in the United States' space program that occurred on January 28, 1986. The Space Shuttle Challenger (OV-099) broke apart only 73 seconds into its flight, leading to the tragic and untimely death of all seven crew members aboard. The incident shook the nation and had a profound impact on the space program, leading to changes in safety procedures and protocols. It was a very tragic time in history that highlighted the risks and complexities of space exploration.