How much lunar regolith did Chang'e 5 aim to return?

How much lunar regolith did Chang'e 5 aim to return?

• A. Approximately 2 kg
• B. Approximately 20 g
• C. Approximately 50 kg
• D. Approximately 100 g

Answer: (A)

The amount a lunar sample return mission aims to bring back is chosen to balance scientific value with the spacecraft’s mass and propulsion constraints. For Chang’e 5, about 2 kilograms was targeted because this is enough material to perform several different analyses—mineralogy, isotopic dating, chemistry, and contamination checks—across multiple labs, while still keeping the return system within feasible size and mass limits. In reality, the mission delivered roughly 1.7 kilograms, which is consistent with that target and sufficient for meaningful study. Choosing a much smaller amount, like tens of grams, would limit how many analyses could be performed and reduce the chance of representing lunar diversity. A far larger target, such as tens of kilograms, would be impractical for the lander–ascender system and the launch vehicle used. So roughly 2 kilograms is the best balance for a successful, scientifically valuable sample return.

The amount a lunar sample return mission aims to bring back is chosen to balance scientific value with the spacecraft’s mass and propulsion constraints. For Chang’e 5, about 2 kilograms was targeted because this is enough material to perform several different analyses—mineralogy, isotopic dating, chemistry, and contamination checks—across multiple labs, while still keeping the return system within feasible size and mass limits. In reality, the mission delivered roughly 1.7 kilograms, which is consistent with that target and sufficient for meaningful study.

Choosing a much smaller amount, like tens of grams, would limit how many analyses could be performed and reduce the chance of representing lunar diversity. A far larger target, such as tens of kilograms, would be impractical for the lander–ascender system and the launch vehicle used. So roughly 2 kilograms is the best balance for a successful, scientifically valuable sample return.