// SPACE.COM — SPAZIO & SCIENZA
Will the new moon race turn Earth's nearest neighbor into a dumping ground?
"I hope that we're going to see a new norm evolve, and that what we have seen now is not how you dispose of your rocket stages in the future."
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An 8,800-pound (4,000 kilograms) Falcon 9 rocket stage hit the moon last Wednesday (Aug. 5), stirring lunar regolith in a massive plume of dust observable all the way from Earth.
The rocket joined some 3,000 manmade objects scattered on the surface of our planet's companion. Some experts think it's about time we start treating the pristine lunar environment with a bit more respect.
Around 200 tons of Earth stuff have been either deliberately left on or crashed into the moon since the beginning of the space age. Some of this material has a prominent place in history books: The descent modules from all six Apollo landing missions, Soviet Lunakhod rovers from the 1970s and China's 2010s Yutu 1 and 2 robots still sit where they had been left or ran out of power.
But there is also a lot of stuff on the moon that wasn't really meant to end up there. Astronomer and space historian Jonathan McDowell says that many rocket stages and other objects left in orbit between Earth and the moon since the first lunar missions in the 1960s may have ended up on the gray dirt. Four years before the Falcon 9 upper stage crashed near Einstein Crater, for example, part of a Chinese Long March 3C rocket slammed into the moon's far side. And experts think such incidents could become increasingly common in the coming years, as exploration of the moon intensifies.
"We're in a transitional moment," McDowell told Space.com. "From the era when there was rare lunar exploration mostly by the U.S. and the Soviet Union, we've seen over the past decade other nations landing on the moon and the beginning of commercial missions. But governance has not kept up with this. We don't have an international set of agreements on how to operate near the moon, how to coordinate activities near the moon, and we're really going to need it because, not only is the amount of activity at the moon increasing, but the number of different players is greatly increasing, too."
Human activities on the moon are governed by the 1967 United Nations Outer Space Treaty, Marieta Valdivia Lefort, a policy officer at the Royal Astronomical Society in the U.K., told Space.com. Article IX of that treaty binds countries to "conduct the exploration of outer space in a way that avoids harmful contamination," she said. But what exactly constitutes such contamination is unclear, she added.
"There are international legal frameworks that apply to activities on the moon and include obligations concerning harmful contamination, but there is no dedicated international 'waste law' or comprehensive 'rubbish-management' system for it," Lefort wrote in an email. "The Outer Space Treaty does not define when contamination becomes 'harmful.' It does not set numerical waste limits, create approved disposal sites or require every object on the moon to be removed."
The moon is big. Its surface area, around 14.7 million square miles (38 million square kilometers) rivals that of Asia, Earth's largest continent, which covers 17 million square miles (44 million square km). But the moon's low gravity — around 17% that of Earth — means the dust that an impact stirs up travels a long way and takes a long time to settle, McDowell said.