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What China’s mission to collect rocks from the far side could reveal about the Moon

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Later this week, China will embark on the world’s second-only trip to the Moon’s far side. The goal is to collect the first rocks from inside the South Pole-Aitken (SPA) basin, the largest and oldest impact crater on the lunar surface, and bring them back to Earth for analysis.

A stack of four spacecraft needed to complete this unprecedented and highly challenging mission, known as Chang’e-6, is now tucked into the nose of a 57-metre-tall Long March 5 rocket, waiting to lift off from the Wenchang Satellite Launch Centre on southern China’s Hainan Island.

“The whole process is very complex and risky,” says Jonathan McDowell, an astronomer at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts.

But he says it’s a risk worth taking: “Samples from the SPA basin would be very interesting scientifically and tell us a lot about the history of the Moon and of the early Solar System.”

Far side science

Because the Moon is tidally locked to Earth, humans were only able to see its near side for thousands of years. In 1959, the first lunar far-side images returned by the Soviet probe Luna 3 revealed a face pocked with mountains and impact craters, in contrast to the relatively smooth near side. Scientists have since been collecting data from satellites orbiting the Moon to understand its little-known other half. In 2019, China’s Chang’e-4 became the first spacecraft to soft land and conduct surveys on the Moon’s far side.

The upcoming Chang’e-6 mission, with its landing site carefully chosen by Chinese scientists and international colleagues, aims to give the first accurate measurements of the age and composition of the geology of the Moon’s far side. It might provide key clues to why the two sides of the Moon are so different — the so-called lunar dichotomy mystery — and help test theories about the early history of the Solar System.

The SPA Basin is a vast indentation on the lower half of the far side some 2,500 kilometres wide and 8 kilometres deep. Inside the northeastern part, Li’s team has identified three potential landing areas. They believe the sites could have a variety of materials formed during repeated asteroid impacts and volcanic eruptions over two billion years, and therefore could be scientifically rich.

The South Pole-Aitken Basin on the lunar far side. The low center is dark blue and purple. Mountains on its edge, remnants of outer rings, are red and yellow.

The South Pole-Aitken Basin is the blue area in the centre of this false-colour image. The indentation is 2,500 kilometres wide.Credit: NASA/GSFC/University Of Arizona

The most likely rock to be collected is basalt — dark-coloured cooled lava — which has previously been brought back to Earth for analysis from the Moon’s near side. With the first far-side basalt samples, scientists will be able to date them and assess their chemical composition, giving clues to their formation. “Then we can make comparative studies to understand why volcanic activities happened on a much smaller scale and ended much earlier on the far side of the Moon,” says Long Xiao, a planetary scientist at the China University of Geosciences in Wuhan.

Being able to pin down the SPA Basin’s age would also be a major achievement, says planetary geologist Carolyn van der Bogert from the University of Münster, Germany. It will help settle the long-standing debate about whether the Moon and the inner Solar System was battered by a massive cluster of asteroids between 4.0 and 3.8 billion years ago. If the SPA Basin is older, then it would cast doubt on the heavy bombardment theory.

Besides basalts, scientists hope that Chang’e-6 will also pick up fragments of other rocks that have been scattered during impact events. If the Chinese mission strikes ejecta the from the deeper lunar crust or mantle, it will be scientific gold.

Engineering challenges

Chang’e-6 was originally built as a backup for the Chang’e-5 mission, which successfully returned 1.73 kilograms of samples from the Moon’s near side in 2020. Because the two craft are identical, site selection for Chang’e-6’s landing was constrained to similar latitudes as Chang’e-5’s and needed a relatively flat surface, says Chunlai Li, the mission’s deputy chief designer from the National Astronomical Observatories in Beijing.

Like its predecessor, Chang’e-6 does not pre-determine its landing site but will use its instrumentation during the descent process to find the safest and most favourable spot. “The landing of Chang’e-6 would be more challenging than Chang’e-5 simply because the far side landing site is more rugged,” says Xiao.

Chang’e-6, like its twin, consists of an orbiter, a lander, an ascender and a re-entry module. When the spacecraft arrives at the Moon, it will separate into two parts, with the lander and ascender headed for the lunar surface while the orbiter and re-entry module remain in orbit.

If it pulls off the difficult soft landing, the lander will drill and scoop up two kilograms of soil and rocks. The sampling process needs to be completed within 48 hours, after which the ascender is intended to blast off from the lander and return to the lunar orbiter. There it is supposed to dock and transfer the precious samples to the re-entry module for the trip home.

During the sample collection and lunar surface liftoff, the Chang’e-6 lander would be unable to directly communicate with Earth. Every command will need to go through a relay satellite named Queqiao-2. Launched last month and now operating in a highly elliptical orbit around the Moon, Queqiao-2 is more powerful than the Queqiao satellite which served the Chang’e-4 mission. Its 4.2-metre umbrella-shaped antenna has the ability to simultaneously serve up to ten spacecraft working on the Moon’s far side.

International collaboration

Chang’e-6 is also carrying scientific payloads from France, Sweden, Italy and Pakistan. The Detection of Outgassing RadoN (DORN), which will be the first French instrument on the Moon, plans to use radon released from the lunar surface as a tracer to study the origin and dynamics of the Moon’s faint atmosphere. Pierre-Yves Meslin, a planetary scientist at the Research Institute in Astrophysics and Planetology in Toulouse, France, says previous spacecraft have measured radon gas movement from orbit, but surface-level radon information is the missing piece of the puzzle.

The Negative Ions at the Lunar Surface, a payload developed in Sweden with funding from the European Space Agency, will seek to answer the question of why no negative ions have yet been detected on the lunar surface. Negative particles could be short-lived, formed either by atoms at the surface snatching electrons from the solar wind, or by molecules breaking apart from the high-energy solar radiation. The biggest challenge for this instrument is overheating, since it needs to face the Sun, says ESA project manager Neil Melville. But he says one hour of operation should be enough to gather the data.

Italy’s National Institute of Nuclear Physics is sending a laser retroreflector for distance measurements. And Pakistan has piggy-backed its first lunar satellite to the Chang’e 6 orbiter, which will deploy after entering the lunar orbit.

Both surface instruments need to complete their work and send data back to Earth within the 48-hour window. “As soon as the samples lift off, the ascender will bring with it the communications and control system it shares with the lander. Even if the instruments on the lander continue to take data, there is no way to receive them here on Earth,” Li says

He says that like Chang’e-5 samples, the returned Chang’e-6 samples will be shared with the international community.

“When those samples come back to Earth, they will be like a Christmas present — whoever opens it will be happily surprised,” Bogert says.

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Scientists urged to collect royalties from the ‘magic money tree’

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A row of three origami dollar seedlings growing in flower pots full of coins

Credit: Richard Drury/Getty

“Lots of our members call us ‘the magic money tree’,” says Alison Baxter, head of communications for the Authors’ Licensing and Collecting Society (ALCS), based in the United Kingdom. “They don’t really understand where the payments come from,” she says, “but they like getting them.” The ALCS is one of a global group of collecting societies and agencies that compensate authors when their works are copied or shared after publication. This year, the ALCS says, it is due to pay out more than £45 million (US$56 million) and, when money is earned from the use of academic textbooks and research papers, the copyright holders who stand to benefit are often scientists.

ALCS members who claimed for journal or magazine articles this year received around £450 each, on average. Although the sums any individual author is entitled to could be much less than that, the fact remains that researchers who are not members might be missing out on their share.

Collecting societies vary in their exact function, but their common goal is to ensure that authors are remunerated when, for example, a company prints out part of a book to circulate among its staff, or a research paper is printed out and distributed to students. The societies generate income by selling licences that give blanket permission to reproduce copy-righted material, or by gathering payments for the use of specific works.

They then share that money among their members on the basis of which activities generated the funds. Although this is a well-established source of income for many authors and journalists, among researchers there is less awareness of its existence. “My oldest friend is a scientist,” Baxter says, “and it took me a while to convince her that she could claim for her papers by joining the ALCS.”

One reason for a lack of take-up might be cynicism among scientists, and a misapprehension about fraud. “Everyone I have told thinks it’s a scam,” says Nicole Melzack, who is studying for a PhD in energy storage at the University of Southampton, UK, and has been a member of the ALCS since last year. “It’s really hard convincing people that it’s not, but, as long as you own the copyright, which I think most people will for their journal articles, then you have nothing to lose by signing up.”

For those who do, collecting societies can provide a welcome and regular cash flow that requires little or no effort to maintain. Yashar Mousavi, a senior analytical engineer at American Axle & Manufacturing, an automotive engineering firm based in Detroit, Michigan, joined the ALCS as a PhD student at Glasgow Caledonian University, UK, in 2020. “I’ve been paid twice so far, each time between £400 and £600, for papers published in the UK in the journal Chaos, Solitons & Fractals on the topic of fractional calculus and optimization,” he says. “The size of payment depends on many factors, such as the amount of money the ALCS has collected, the number of papers I have shared with them, the percentage of my contribution to the paper, and the journal’s impact factor.”

Even early-career researchers who do not have many publications can benefit, says Melzack. “In 2023, I had one paper published in Frontiers in Energy Research and made £464, and this year I published five papers and got £357,” they say. “It’s great, given the general cost of living and the fact that the academic publishing ecosystem involves so much unpaid labour, so to get something for a paper I’ve written feels validating in some way too.”

Portrait of Nicole Melzack

Nicole Melzack says that scientists who own the copyright in their publications have nothing to lose by joining a collecting society.Credit: Nicole Melzack

For scientists who publish outside academic journals, the rewards can be even greater. Isabel Thomas, a freelance science writer and children’s book author based in Cambridge, UK, joined the ALCS in 2014. “Since then I’ve had payments every six months, ranging from £77 to £8,000,” she says. “The ALCS also approached a friend of mine who writes practice exam papers and it turned out they were holding almost £30,000 due to her.”

How do collecting societies work?

Collecting societies might seem unusual in the context of academic research, but they are long established in other fields. For example, the Performing Right Society in the United Kingdom and the American Society of Composers, Authors and Publishers in the United States, both founded in 1914, collect fees for music played in public, then distribute the money to the composers and songwriters concerned. Other organizations ensure that artists and photographers are paid when their images are used.

The same principles apply to written work and authors. The ALCS was founded in 1977 by a group of writers who realized that photocopiers were enabling people to reproduce and share works without the creators being compensated. They also set up an accompanying body, the Copyright Licensing Agency (CLA), which collects money that the ALCS then distributes to writers.

The CLA sells and manages collective licences that give organizations the legal right to reproduce copyrighted works (whereas the ALCS handles payments to copyright holders). Baxter says that schools and universities, as well as the UK National Health Service and businesses, all pay the CLA for a licence. “That then means that their staff, students or users are allowed to copy sections of the books they own and share them, both physically and digitally.” The money generated is split between the publishers and authors.

Many other countries have similar collective licensing bodies. The Copyright Agency in Australia, the Indian Reprographic Rights Organisation, CADRA in Argentina and Canada’s Access Copyright all generate revenue through similar processes. The Copyright Clearance Center (CCC) is responsible for similar licences in the United States, but sends payments to publishers for distribution to authors.

Collecting societies also act as advocates and support networks. CADRA, for example, has been particularly successful in attracting researchers, who make up an estimated 40% of its members. Executive director Magdalena Iraizoz, who is based in Buenos Aires, says, “If a scientist has published work, being a member of CADRA not only gives them the benefit of receiving payments for the secondary uses of their works, but also free legal protection against piracy and illegal reproduction.”

How to collect payments

Anyone with publications to their name can join a collecting society and potentially receive payments. Baxter advises that scientists first determine what copyrights they own. “With books, authors aren’t generally asked to sign their copyright away,” she says. “In cases where they do have to, like when publishing in some academic journals, the contract can include a ‘quick clause’ that means the writer can still receive money from us.” These clauses can also apply to work that is published open access.

Authors then need to join the relevant collecting society. This will generally be one based in the country in which their work has been published, although many have reciprocal agreements that allow them to collect income generated overseas that is owed to their members. In its 2022–23 financial year, the Copyright Agency paid out Aus$142 million (US$92 million) to rights holders in Australia and elsewhere. “Most of our direct payments are to Australian writers, artists and publishers,” says a spokesperson for the Copyright Agency. “Most payments from copyright fees we collect for non-Australian works are made via copyright-management organizations similar to us in other countries.”

Portrait of Isabel Thomas leaning on some of her published books

Science writer Isabel Thomas’s biannual collecting-society payments have ranged from £77 to £8,000.Credit: Elodie Guige

The majority of collecting societies are members of the International Federation of Reproduction Rights Organisations and are listed on its website. Generally, they do not ask individuals for a joining fee and instead take a small percentage from payments they distribute.

Scientists who join the ALCS can register any book with a unique International Standard Book Number (ISBN) product identifier, but only papers or articles published in the past three years in a journal with a UK-based International Standard Serial Number (ISSN) qualify. Baxter recommends that members list anything they think might be eligible. “For journals, we operate on a claim scheme,” she explains. “So, we gather money for a particular ISSN. Then we ask people to tell us what they’ve written and anyone who has contributed to that journal gets a share of the pot.”

CADRA operates in a similar way. “For a scientist to become a member of CADRA, they must have written work published with an Argentinian ISBN or ISSN,” says Iraizoz. “They must then sign the association contract and, once their incorporation is approved, they will be able to be part of the next distribution of rights.” Essentially, researchers list what they own and collecting societies will determine what they’re owed.

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