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Lunar Rocks Celebrate 50th Anniversary

Inside a locked vault at Johnson Space Center are hundreds of pounds of moon rocks collected by Apollo astronauts a half-century ago. And for the first time in decades, NASA is about to open some of the pristine samples and let geologists take a crack at them with 21st-century technology.

“It’s sort of a coincidence that we’re opening them in the year of the anniversary,” explained NASA’s Apollo sample curator Ryan Zeigler. “But certainly the anniversary increased the awareness and the fact that we’re going back to the moon.”

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Zeigler’s job is to preserve what the 12 moonwalkers brought back from 1969 through 1972 – lunar samples totaling 842 lb. (382 kg) – and ensure scientists get the best possible samples for study.

Some of the soil and bits of rock were vacuum-packed on the moon – and never exposed to Earth’s atmosphere – or frozen or stored in gaseous helium following splashdown and then left untouched. The lab’s staff is now trying to figure out how best to remove the samples from their tubes and other containers without contaminating or spoiling anything. They’re practicing with mock-up equipment and pretend lunar dirt.

Compared with Apollo-era tech, today’s science instruments are much more sensitive, Zeigler noted. “We can do more with a milligram than we could do with a gram back then. So it was really good planning on their part to wait,” he said.

The lunar sample lab has two side-by-side vaults: one for rocks still in straight-from-the-moon condition and a smaller vault for samples previously loaned out for study. About 70% of the original haul is in the pristine sample vault, which has two combinations and takes two people to unlock. About 15% is in safekeeping at White Sands in New Mexico. The rest is used for research or display.

Of the six manned moon landings, Apollo 11 yielded the fewest lunar samples: 48 lb. or 22 kg. It was the first landing by astronauts and NASA wanted to minimize their on-the-moon time and risk. What’s left from this mission – about three-quarters after scientific study, public displays and goodwill gifts to all countries and U.S. states in 1969 – is kept mostly here at room temperature.

Armstrong was the primary rock collector and photographer. Aldrin gathered two core samples just beneath the surface during the 2 1/2-hour moonwalk. All five subsequent Apollo moon landings had longer stays. The last three – Apollo 15, 16 and 17 – had rovers that significantly upped the sample collection and coverage area.

By studying the Apollo moon rocks, Zeigler said, scientists have determined the ages of the surfaces of Mars and Mercury, and established that Jupiter and the solar system’s other big outer planets likely formed closer to the sun and later migrated outward.

“So sample return from outer space is really powerful about learning about the whole solar system,” he said.