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Astronauts upgrade space station batteries in second all-woman spacewalk – Space.com

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HOUSTON — The second all-female spacewalk in history continued the work of the first, as the same two NASA astronauts upgraded batteries outside the International Space Station.

Jessica Meir and Christina Koch completed a 7-hour and 29-minute extravehicular activity (EVA, or spacewalk) on Wednesday (Jan. 15), replacing the batteries that store power for one pair of the space station’s electricity-generating solar arrays. The excursion resumed the work that the two Expedition 61 flight engineers performed in October, which made headlines as the first spacewalk by two women.

“It was truly amazing for Christina and me to be back out here today,” Meir said during a live broadcast of the spacewalk. “We have been talking about it a lot and it was really something we were looking forward to.”

Related: The amazing spacewalks of Expedition 61 in photos

The spacewalk began at 6:35 a.m. EST (1135 GMT), when both Koch and Meir switched their spacesuits over to internal power.

“It’s a beautiful view out here,” said Meir, soon after exiting the Quest airlock.

The two spacewalkers removed three degraded nickel-hydrogen batteries and installed two more powerful lithium-ion batteries for the space station’s port, or left side, outboard solar arrays. Meir and Koch stowed the older batteries, which had been in place for the past decade, on an external pallet for their later disposal and installed adapter plates to enable the new batteries to work with the orbiting laboratory’s power system.

NASA astronauts Jessica Meir (in foreground, in spacesuit with red stripes) and Christina Koch (in background, in spacesuit with no stripes) perform the the second all-female spacewalk in history, upgrading batteries outside of the International Space Station on Wednesday (Jan. 15, 2020). (Image credit: NASA TV)

“Awesome job,” radioed astronaut Stephanie Wilson from inside Mission Control at NASA’s Johnson Space Center in Houston, from where she was helping to guide Meir and Koch through the spacewalk’s tasks. “We made great progress toward upgrading the batteries on the 4B side. You’re both awesome, nice work!” 

Each battery measures about half the size of a refrigerator, or 40 inches long by 37 inches wide by 19 inches high (101 by 94 by 48 centimeters). The old nickel-hydrogen batteries weigh 365 lbs. (165 kilograms) each. The lithium-ion replacements weigh 428 lbs. (194 kg).

The work contributed to a larger, ongoing effort to replace all 48 of the station’s degraded nickel-hydrogen batteries with the more capable lithium-ion units. One lithium-ion battery and one adapter plate can replace two nickel-hydrogen batteries. The work began with a series of spacewalks in January 2017 and has continued as Japan’s H-II Transfer Vehicles (HTVs) have delivered the new batteries to the station.

NASA astronaut Jessica Meir (left) holds a replacement lithium-ion battery to be installed on the International Space Station’s port-side truss during her and Christina Koch’s spacewalk on Wednesday (Jan. 15, 2020).  (Image credit: NASA TV)

Meir and Koch’s spacewalk on Wednesday proceeded mostly to plan, with the exception of a minor issue with Koch’s spacesuit early in the EVA.

“Christina’s helmet lights are not attached,” radioed Meir to Mission Control, as the assembly normally attached to the top of Koch’s spacesuit helmet dangled from its power cable. “The cable is still attached, of course, but the camera and the helmet lights have been detached from her helmet.” 

Meir attempted to reattach the light assembly, but it would not lock into place. The two lights are used as an aid when the space station passes into Earth’s shadow and is not lit by the sun.

“We think with the light locks installed you are not going to be able to get the helmet light seated onto the grooves. So instead, we would like to de-mate the power cable and completely remove the assembly,” Wilson told the two spacewalkers. 

NASA astronaut Christina Koch (left) looks on as Jessica Meir uses a pistol-grip tool to secure a battery outside of the International Space Station on Wednesday (Jan. 15, 2020), in this view from Meir’s helmet-mounted camera.  (Image credit: NASA TV)

The spacewalk continued with Koch staying close to Meir so that she was aided by the lights still attached to Meir’s helmet.

Wednesday’s EVA, which ended at 2:04 p.m. EST (1904 GMT), marked Koch’s fifth and Meir’s second career spacewalks.

Meir, who served as EV1 (or lead spacewalker) and wore the Extravehicular Mobility Unit (EMU) spacesuit with red stripes, has logged a total of 14 hours and 46 minutes on her two EVAs. Koch, who as EV2 wore the suit with no identifiers, has a total of 35 hours and 17 minutes spanning her five spacewalks.

This was the 225th EVA devoted to the International Space Station since assembly of the orbiting outpost began in 1998.

Meir and Koch are scheduled to again venture outside together on Monday (Jan. 20) to complete the replacement of the batteries on the port P6 truss.

Robert Pearlman is a Space.com contributing writer and the editor of collectSPACE.com, a Space.com partner site and the leading space history news publication. Follow collectSPACE on Facebook and on Twitter at @collectSPACE. Follow us @Spacedotcom and Facebook.

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Orionid meteor shower to reach peak on Thursday, but full moon may interfere – CTV News

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TORONTO —
The Orionid meteor shower is expected to reach its peak in the early hours of Thursday morning, but the full moon may obstruct the show for celestial watchers.

According to NASA, the Orionid meteor shower is active from Oct. 2 to Nov. 7 with the height of activity expected early Oct. 21.

Unfortunately, this falls on the day after the full moon, or “Hunter’s Moon,” reaches its peak illumination on Wednesday morning, appearing full from Monday night through Thursday morning. This means the light of the full moon will interfere with spectators’ ability to see the meteors this year, NASA said.

Usually, the Orionids are considered to be “one of the most beautiful showers of the year,” according to the space agency, and they’re known for their brightness and for their speed.

Due to their speed – they travel at approximately 66 km/s into the Earth’s atmosphere – they can leave “glowing trains” or incandescent bits of debris in the wake of the meteor, which last for several seconds to minutes.

“Fast meteors can also sometimes become fireballs: Look for prolonged explosions of light when viewing the Orionid meteor shower,” NASA said. “The Orionids are also framed by some of the brightest stars in the night sky, which lend a spectacular backdrop for these showy meteors.”

Meteors are formed from leftover comet particles and bits from broken asteroids, according to NASA. When comets travel around the sun, they create a dusty trail around their orbits, which the Earth then passes through every year. When the bits collide with Earth’s atmosphere, they disintegrate to create “fiery and colourful streaks” in the sky.

In the case of the Orionids, the meteors originate from the ice and dust from Halley’s Comet when it returns to the inner solar system.

While the full moon is expected to hamper the view of the shower this year, those in the Northern and Southern hemispheres can still try to catch a glimpse of the meteors during the hours after midnight on Thursday.

According to NASA, hopeful viewers should try to find an area away from city or street lights. They should bring a sleeping bag, blanket, or lawn chair and lie flat on their backs with their feet facing southeast (if they’re in the Northern Hemisphere) and look up. 

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Crop diversity is needed today for tomorrow's food security and nutrition – Phys.org

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by The Alliance of Bioversity International and the International Center for Tropical Agriculture

Bean diversity at the CGIAR gene bank in Colombia. Credit: Neil Palmer / CIAT

Although scientists have been ringing bells for more than 100 years about the decline of crop diversity in agriculture, questions about the magnitude, causes, and significance of this loss remain unanswered.

A team of 15 scientists from a wide range of research centers and universities set out 18 months ago to answer these persisting questions, resulting in the largest review ever conducted of evidence about change in crop diversity over time worldwide. The team reviewed hundreds of primary literature sources published over the last 80 years that examine potential crop diversity loss, also called “genetic erosion”. The global collaborative effort found that 95% of all studies reported diversity change, and almost 80% found evidence of loss.

Economic, agricultural, technological, climatic, and political changes during the last 100 years have together led to the decline or disappearance of diversity important to agriculture, both from cultivated fields and from wild habitats. Much of the crop diversity that remains continues to face the threat of erosion or even extinction, while also becoming more homogenous across local landscapes and around the world.

“The global picture that emerges from our review is that of enormous loss over a relatively short period of time of traditional agricultural diversity, which was nurtured by many cultures around the world over the last 10,000 years,” said lead author Colin Khoury, Senior Director for Science and Conservation at San Diego Botanic Garden and research scientist at the Alliance of Bioversity International and the International Center for Tropical Agriculture (CIAT). “Yet the picture also provides hope, as considerable crop diversity persists, and because it shows that agriculture can be re-diversified.”

Khoury collaborated with scientists at international and national agricultural research centers in the U.S., Colombia, Germany, Italy, Mexico, and Peru, as well as universities including El Colegio de la Frontera Sur (Chiapas, Mexico), Ohio State University, Saint Louis University, the University of Arizona, the University of California at Davis, the University of Cambridge, and the University of Illinois to carry out the study, which published in New Phytologist as a Tansley review. This review series was named after the famous English botanist and ecologist Arthur Tansley, who coined the term ecosystem in 1935.

Crop diversity is a critically important resource for agriculture and for human nutrition. This diversity keeps crops productive as they face pests and diseases, provides resilience during extreme weather and other shocks and offers the potential to adapt to changing climates and meet new market demands. In contributing to crop productivity and also to dietary diversity, it underpins food security and nutrition.

“The magnitude of crop diversity loss we have seen in some regions of the world underscores the importance of conserving this diversity outside of these ecosystems as well as within them,” said Luigi Guarino, Director of Science at the Crop Trust, and one of the study’s authors. “Collections of crop diversity such as those in agricultural genebanks and botanic gardens can mitigate local and regional losses, enable the future reestablishment of diversity on farms, and preserve the availability of crops for future use by all. We need to strengthen these repositories and duplicate unique collections in other locations to insure against the risk of loss,” he said.

There are approximately 1,750 genebanks worldwide, maintaining over seven million samples of crop diversity, with , universities, nonprofits, community seed banks, and local conservation networks further contributing to ex-situ conservation. However, more work is needed to conserve the full range of diversity at risk of disappearing from farmers’ fields and, in the case of crop wild relatives, the wild progenitors and cousins of cultivated plants, from grasslands, forests and other natural habitats.

The study analyzed the change in the diversity of traditional crop varieties, or landraces, cultivated on farms; of modern crop cultivars in agriculture; of crop wild relatives in their natural habitats; and of crop genetic resources held in ex situ conservation repositories. The extent of change over time in these environments, while considerable, varied by crop, location, and analytical approach.

“The good news is that while we found evidence of enormous diversity loss over the past decades in each of the environments we studied, we also saw significant maintenance of that diversity in some contexts, and even marked increases in specific instances,” said Stephen Brush, second author for the study and Professor Emeritus of Human Ecology and former Master Adviser for International Agricultural Development at UC Davis.

Diversity of traditional crops remains high on farms and in gardens where landraces are valued for their unique agricultural and societal uses. One-third of the 139 studies of changes in traditional crop varieties reported the maintenance of this diversity over time, and almost one-quarter found evidence for the appearance of new diversity. Also, crop breeders have made significant strides toward diversifying modern crop cultivars in recent decades.

“For crop diversity to continue evolving alongside pests and diseases, in response to climate change, and to meet demands for improved that provide both economic products and ecological services, we need to redouble support for conservation efforts in situ, or in the field, as well as ex situ,” said co-author Allison Miller, Member and Principal Investigator at the Danforth Plant Science Center and Professor of Biology at Saint Louis University.

“In reviewing global change in the that underpins everyone’s food security and nutrition, it’s obvious that there has been major loss, but also that the tools, methods, and knowledge exist to stop its further erosion,” said Khoury. “It is a matter of priorities and resources. To go a major step further and start to reverse the diversity trend, though, is a much bigger task. It requires no less than reframing our food systems, and even the societies they nourish, as -supportive processes.”


Explore further

First comprehensive network of wild crop species will help breeders tackle food insecurity


More information:
Colin K. Khoury et al, Crop genetic erosion: understanding and responding to loss of crop diversity, New Phytologist (2021). DOI: 10.1111/nph.17733

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Crop diversity is needed today for tomorrow’s food security and nutrition (2021, October 20)
retrieved 20 October 2021
from https://phys.org/news/2021-10-crop-diversity-today-tomorrow-food.html

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Vikings crossed the Atlantic before Columbus, reaching Newfoundland: Scientists – Toronto Sun

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Long before Columbus crossed the Atlantic, eight timber-framed buildings covered in sod stood on a terrace above a peat bog and stream at the northern tip of Newfoundland, evidence that the Vikings had reached the New World first.

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But precisely when the Vikings journeyed to establish the L’Anse aux Meadows settlement had remained unclear – until now.

Scientists on Wednesday said a new type of dating technique using a long-ago solar storm as a reference point revealed that the settlement was occupied in 1021 AD, exactly a millennium ago and 471 years before the first voyage of Columbus. The technique was used on three pieces of wood cut for the settlement, all pointing to the same year.

The Viking voyage represents multiple milestones for humankind. The settlement offers the earliest-known evidence of a transatlantic crossing. It also marks the place where the globe was finally encircled by humans, who thousands of years earlier had trekked into North America over a land bridge that once connected Siberia to Alaska.

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“Much kudos should go to these northern Europeans for being the first human society to traverse the Atlantic,” said geoscientist Michael Dee of the University of Groningen in the Netherlands, who led the study published in the journal Nature.

The Vikings, or Norse people, were seafarers with Scandinavian homelands: Norway, Sweden and Denmark. They ventured through Europe, sometimes colonizing and other times trading or raiding. They possessed extraordinary boat-building and navigation skills and established settlements on Iceland and Greenland.

“I think it is fair to describe the trip as both a voyage of discovery and a search for new sources of raw materials,” Dee said. “Many archaeologists believe the principal motivation for them seeking out these new territories was to uncover new sources of timber, in particular. It is generally believed they left from Greenland, where wood suitable for construction is extremely rare.”

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Their wooden vessels, called longboats, were propelled by sail and oars. One surviving example, called the Oseberg ship, is roughly 70 feet (21.6 metres long).

The Viking Age is traditionally defined as 793-1066 AD, presenting a wide range for the timing of the transatlantic crossing. Ordinary radiocarbon dating – determining the age of organic materials by measuring their content of a particular radioactive isotope of carbon – proved too imprecise to date L’Anse aux Meadows, which was discovered in 1960, although there was a general belief it was the 11th century.

The new dating method relies on the fact that solar storms produce a distinctive radiocarbon signal in a tree’s annual growth rings. It was known there was a significant solar storm – a burst of high-energy cosmic rays from the sun – in 992 AD.

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In all three pieces of wood examined, from three different trees, 29 growth rings were formed after the one that bore evidence of the solar storm, meaning the wood was cut in 1021, said University of Groningen archaeologist Margot Kuitems, the study’s first author.

It was not local indigenous people who cut the wood because there is evidence of metal blades, which they did not possess, Dee said.

The length of the occupation remains unclear, though it may have been a decade or less, and perhaps 100 Norse people were present at any given time, Dee said. Their structures resembled Norse buildings on Greenland and Iceland.

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Oral histories called the Icelandic Sagas depict a Viking presence in the Americas. Written down centuries later, they describe a leader named Leif Erikson and a settlement called Vinland, as well as violent and peaceful interactions with the local peoples, including capturing slaves.

The 1021 date roughly corresponds to the saga accounts, Dee said, adding: “Thus it begs the question, how much of the rest of the saga adventures are true?”

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