A return to the moon to mine its soil for helium 3 could serve as a "bridge" for humans to explore Mars and the rest of the solar system while providing a clean energy source for a growing population on Earth, one of the last two men to stand on Earth's satellite argued. Harrison Schmitt, the only scientist to visit the moon and a former U.S. senator, told reporters in Washington that the helium isotope deposited in the lunar regolith by the solar wind could fuel a fusion energy ...

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