HOUSTON – Inside a locked vault at Johnson Space Center is treasure few have seen and fewer have touched.
The restricted lab is home to hundreds of pounds of moon rocks collected by Apollo astronauts close to 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.
What better way to mark this summer's 50th anniversary of humanity's first footsteps on the moon than by sharing a bit of the lunar loot.
“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, covered head to toe in a white protective suit with matching fabric boots, gloves and hat.
“But certainly the anniversary increased the awareness and the fact that we're going back to the moon.”
With the golden anniversary of Neil Armstrong and Buzz Aldrin's feat fast approaching – their lunar module Eagle landed July 20, 1969, on the Sea of Tranquility – the moon is red-hot again.
Zeigler's job is to preserve what the 12 moonwalkers brought back from 1969 through 1972 – lunar samples totaling 842 pounds – 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, then left untouched. The lab's staff is 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.
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 pounds. 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 21/2-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.
Andrea Mosie, who's worked with the Apollo moon rocks 44 years and was a high school intern at Johnson Space Center in July 1969, remembers the Polaroid photos and handwritten notes once accompanying each sample. She sometimes gets emotional when talking to children about the moonshots and does her best to dispel any notion that the rocks aren't from the moon and the lunar landings never happened.
“The samples are right here and they're still in a pristine state,” she assures young skeptics.
Most of the samples to be doled out over the next year were collected in 1972 during Apollo 17, the final moonshot and the only one to include a geologist, Harrison Schmitt. He occasionally visits the lunar sample lab and plans to help open the fresh specimens.
The nine U.S. research teams selected by NASA will receive varying amounts.
“Everything from the weight of a paperclip, down to basically so little mass you can barely measure it,” Zeigler said. Especially tricky will be extracting the gases that were trapped in the vacuum-sealed sample tubes. The lab hasn't opened one since the 1970s.
The total Apollo inventory now exceeds 100,000 samples.