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Apollo moon rocks shed new light on Earth’s volcanoes
登月五十週年 阿波羅任務岩石解密地球

A rock from the moon is displayed inside a plexiglass case during a gala reuniting the Apollo team responsible for the historic lunar landing 50 years ago aboard the USS Hornet in Alameda, California, US, on Tuesday.
裝在塑膠玻璃中的一塊月球岩石,週二展示於美國加州阿拉米達的大黃蜂號航空母艦博物館中,歡慶五十年前負責歷史性登月的阿波羅團隊重聚盛會。

Photo: AFP
照片:法新社

Fifty years after humans first set foot on the moon, scientists believe rock samples collected by Apollo astronauts could help predict volcanic eruptions on Earth more accurately.

The basaltic fragments, similar to most of the Earth’s volcanic rock, are the remains of the moon’s volcanic past, with studies showing evidence of eruptions up until 1.5 billion to 2 billion years ago. By examining samples from the moon, as well as Mars and the asteroid Vesta, scientists are comparing how rocks are formed under different gravitational conditions; specifically, how gravity affected the magma within rocky bodies billions of years ago.

“At the moment we are facing a disconnect in volcanology where we can monitor what’s happening in a volcano in the present but it’s very difficult to see the future because we have no reference to the past,” Matt Pankhurst of the Canarian Volcanological Institute (INVOLCAN) in Tenerife, leader of the study team, told Reuters. “We’re looking at moon rocks because they have something very special in that they were formed in a lower gravity environment and that changes how the crystals and the melt behave with one another as they’re forming. So studies like this give us a baseline to understand processes that happen at terrestrial gravity on Earth,” he said.

For the study, NASA has loaned 18 lunar samples that are normally kept under lock and key at Johnson Space Center (JSC) in Houston, Texas. Between 1969 and 1972 over 2,000 separate samples were collected by the six Apollo missions to land on the moon, amounting to 382kg of rocks, pebbles and dust from the lunar surface.

Ryan Zeigler, NASA’s Apollo sample curator, said the samples used in the study are from the Apollo 12 and 15 missions, some of which came from a wide area of the lunar surface. “Apollo 15 was the first mission where they had the rover (space exploration vehicle) so they were able to traverse a larger area. So they were able to visit a basaltic feature called a rille; basically an old collapsed lava tube. And so this is from a volcanic area, not unlike Hawaii,” Zeigler, holding a fragment of moon rock encased in resin, told Reuters at the Diamond Light Source institute in the UK, where the research is being carried out.

TODAY’S WORDS
今日單字

1. volcanic adj.

火山的 (huo3 shan1 de5)

2. eruption n.

爆發 (bao4 fa1)

3. basaltic adj.

玄武岩的

(xuan2 wu3 yan2 de5)

4. under lock and key phr.

安全地鎖好 (an1 quan2 de5 suo2 hao3)

5. rille n.

月溪;溝紋 (yue4 xi1; gou1 wen2)

6. synchrotron n.

同步加速器

(tong2 bu4 jia1 su4 qi4)


Scientists in Tenerife, the US and the UK are conducting the study. Diamond Light Source, near Oxford, is the UK’s national synchrotron science facility, which produces intense beams of light. Here electrons are accelerated to near light speeds until they emit light 10 billion times brighter than the sun, and then directed into laboratories in “beamlines” which allow scientists to study minute specimens using X-ray beams in extreme detail without damaging them.

Pankhurst said it allows them to study “the individual histories of individual crystals” within the rocks. “We’re looking inside the sample and looking at it in ways that we’ve never been able to see before,” he said, while carefully placing a sample into the machine. “If you want to understand how the volcanoes on Earth are going to erupt and in what timescale they’re going to erupt on, studying rocks from other planets will help you actually learn about that more,” said Zeigler.

The study, funded by the UK government and research charity the Wellcome Trust, could also aid our understanding of lunar and planetary formation. “Understanding how volcanism works on other planets lets us understand how the whole solar system formed. So if we want to know how we went from a giant ball of dust to nine planets orbiting around the sun... this is how we’re going to do it; studies like this, on rocks like this,” Zeigler said.

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