In total, there were 17 Apollo missions that were launched by NASA as part of the Apollo space program. These missions were aimed at landing humans on the moon and bringing them safely back to Earth. Out of these 17 missions, only one resulted in the loss of human life.

The mission that ended in tragedy was Apollo 1, which was scheduled to be the first manned mission of the Apollo program. However, on January 27, 1967, a cabin fire broke out during a pre-launch test, resulting in the deaths of all three crew members: Virgil "Gus" Grissom, Edward H. White II, and Roger B. Chaffee. The cause of the fire was determined to be faulty wiring and a pure oxygen atmosphere inside the cabin, which created a highly flammable environment.

This tragic event led to significant changes in the Apollo program, including redesigning the spacecraft to improve safety measures, such as using a mixed oxygen and nitrogen atmosphere instead of pure oxygen. The investigation into the Apollo 1 fire also led to improvements in astronaut training and emergency procedures to prevent similar accidents from happening in the future.

Despite the loss of life in the Apollo 1 mission, NASA continued with the Apollo program and successfully landed astronauts on the moon during the later missions. The most famous of these missions was Apollo 11, which successfully landed astronauts Neil Armstrong and Buzz Aldrin on the moon on July 20, 1969.

Overall, the Apollo program was a major milestone in space exploration and paved the way for future missions to explore the cosmos. While the loss of life in the Apollo 1 mission was a tragic reminder of the risks involved in space travel, it also served as a valuable lesson in improving safety measures and ensuring the well-being of astronauts on future missions.

In conclusion, the Apollo 1 mission was the only Apollo mission that resulted in the loss of human life, but it played a crucial role in shaping the future of space exploration and ensuring the safety of astronauts on subsequent missions.

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