NASA is upset about being excluded from China's Chang’e-6 Moon mission, which is sharing lunar samples with other countries like Italy, France, and Pakistan. The issue stems from the U.S. Wolf Amendment, which restricts NASA from collaborating with China on space projects. To receive the samples, the U.S. needs to lift these restrictions, but China is in no hurry to accommodate. Adding to the tension, NASA's promise to return to the Moon by 2026, ahead of China’s 2030 goal, makes cooperation ev...