Summary of Key Points
Chang'e-7 is scheduled to launch towards the Moon in August this year, with its primary mission being to search for water ice in the permanently shaded craters at the Moon's south pole. This water ice would not only solve the drinking water issue for future lunar explorers but, more importantly, can be split into hydrogen and oxygen through electrolysis—these two components serve as the "fuel combination" for spacecraft, allowing for the establishment of "gas stations" on the Moon. This would significantly reduce the cost of space exploration and make deep-space travel more feasible.
Detailed Explanation
1. Why are the permanently shaded craters at the Moon's south pole so desirable?
The Moon's south pole is home to many craters, and some areas are completely obscured by terrain, never receiving sunlight. The temperatures there drop to below -200 degrees Celsius, creating a natural "super refrigerator." Water in these regions does not evaporate and can be preserved in ice for long periods. Previous probes (such as Chang'e-5) have detected signs of water on the Moon, but the permanently shaded craters at the south pole are the most likely locations to contain large amounts of water ice. After all, to find water ice, one would have to search in this "icebox."
2. Water ice is more than just "space mineral water"; it's a "fuel bank"
Many people think of water ice as something for astronauts to drink, but its value goes far beyond that. The chemical formula for water is H₂O, and by using electrolysis (similar to the process of splitting water into hydrogen and oxygen at home), these two components can be obtained. Hydrogen is the main fuel for rockets, while oxygen acts as an oxidizer—Together, they form the "fuel" for spacecraft. Currently, transporting one kilogram of fuel to space costs hundreds of thousands of dollars. If water ice could be produced on the Moon, the cost would be cut in half or even more, making space travel much more affordable.
3. Lunar gas stations could make space exploration both cheaper and more efficient
Think about long-distance driving: without gas stations, you would have to fill up the tank completely, which increases the weight and fuel consumption. The same principle applies to space exploration. If we were to travel to Mars, carrying enough fuel from Earth would be extremely heavy and costly. However, if we could refuel on the Moon first, we could reduce the weight of the spacecraft, saving a significant amount of money. Additionally, the Moon's gravity is lower than Earth's, so less fuel would be required for departure. Such gas stations would act as "transfer stations" in space, making journeys to Mars or asteroids much easier.
4. What does this have to do with us?
Don't think that space exploration is far from us! Space technology often has practical applications in our daily lives. Technologies like the Beidou navigation system, vegetables grown in space, and medical CT scans all originate from space exploration. If lunar gas stations become a reality, the cost of space tourism could decrease, potentially allowing ordinary people to experience space travel. Moreover, the space industry will drive the development of new materials and energy sources, creating more job opportunities and improving our lives.
5. Is this technology feasible?
The technology of electrolyzing water is already well-established (it can be done at home). As long as there is electricity on the Moon (for example, from solar panels or nuclear batteries), the process can be carried out. The preparation for Chang'e-7's mission is also thorough, as the Chang'e series has accumulated extensive experience in lunar exploration, and the equipment for finding water ice has been thoroughly tested. Therefore, this is not just a pipe dream but is based on solid foundations.