Water exists on Mars, according to a team of geophysicists, and not just as ice on its poles or as vapor in its atmosphere. The scientists have found evidence of liquid water deep in its outer crust, based on their analysis of data provided by NASA's Mars Insight Lander. Specifically, they analyzed four years' worth of ground motions recorded by the lander's seismometer. By looking at seismic velocities, or how fast seismic waves travel on the planet, they were able to determine the materials that the waves moved through. What they found was that Mars' mid-crust has fractured igneous rocks saturated with liquid water.
One of the scientists involved in the study, Prof Michael Manga from the University of California, Berkeley, told the BBC that they implemented the same techniques used "to prospect for water on Earth, or to look for oil and gas." He said his group's findings can answer the question of where all the water on Mars had gone, because features on the planet's surface showed that it had lakes and rivers around three billion years ago. While there's a theory that most of that water was lost to space, scientists have challenged that idea in recent years. One study by Caltech and NASA JPL published in 2021 found data that most of that water is still trapped in the planet's crust.
The scientists involved in this newer study, published in PNAS, were only able to analyze seismic velocity data taken from underneath the lander. However, they believe that similar underground water reservoirs exist all over the planet, and they estimate that there's enough liquid water under the surface to form a layer across Mars that's half a mile deep. Manga told the the BBC that "much of our water is underground and there's no reason for that not to be the case on Mars too."
While the team's findings could be taken as good news for space agencies and private companies looking to visit and even form human colonies on the planet, it won't be easy reaching Mars' water reservoirs. They're located around 7 to 12.5 miles below the surface, which won't be easy to reach even on our planet. "Drilling a hole 10km (6 miles) deep on Mars — even for [Elon] Musk — would be difficult," Manga said, adding that "without liquid water, you don't have life."
This article originally appeared on Engadget at https://www.engadget.com/science/space/scientists-find-evidence-of-liquid-water-deep-underneath-the-martian-surface-120054729.html?src=rss
China’s Chang’e 5 rover has found tiny glass beads containing water in an impact crater on the Moon. Samples collected from a 2020 mission found beads with water content as high as 2,000 parts per million (PPM). Given the prevalence of these glass spheres on the lunar surface, there may be enough to provide 71 trillion gallons of water.
Some beads formed when asteroids collided with the Moon millions of years ago, while others came from ancient volcanoes. Scientists believe the water originated from a chemical reaction when hydrogen ions emitted from the sun — transported to the lunar surface from solar winds — combined with oxygen atoms inside the beads. The water-filled beads are tiny, ranging from “tens of micrometers to a few millimeters.” Still, there are enough on the Moon’s surface to (theoretically) supply an estimated 270 trillion kilograms of water — enough to fill 100 million Olympic-sized swimming pools.
However, scientists haven’t yet figured out how to collect them, and they would need to heat them to around 212 degrees Fahrenheit to extract water. Still, they could be a resource for future lunar settlements, where astronauts could use water for drinking, bathing, cooking, cleaning and even producing rocket fuel.
Scientists believe other moons in our Solar System may have similar beads. “Our direct measurements of this surface reservoir of lunar water show that impact glass beads can store substantial quantities of solar wind-derived water on the moon and suggest that impact glass may be water reservoirs on other airless bodies,” the study’s authors wrote. “The presence of water, stored in impact glass beads, is consistent with the remote detection of water at lower-latitude regions of the Moon, Vesta and Mercury. Our findings indicate that the impact glasses on the surface of Solar System airless bodies are capable of storing solar wind-derived water and releasing it to space.”
The glass beads aren’t our first glimpse at water on the Moon. In 2009, NASA crashed a probe into the Cabeus crater that led to water detection; in 2018, NASA found direct evidence of ice deposits in the Moon’s permanently shadowed craters on its north and south poles. NASA and China / Russia plan to put lunar bases at the Moon’s South Pole within the next decade; the competing initiatives both hope to have inhabitable bases ready by the early-to-mid-2030s.
This article originally appeared on Engadget at https://www.engadget.com/water-trapped-in-tiny-glass-beads-on-the-moon-could-hydrate-future-settlements-200030344.html?src=rss
Whether you live in the rapidly drying American West or are aboard the International Space Station for a six-month stint, having enough water to live on is a constant concern. As climate change continues to play havoc on the West’s aquifers, and as humanity pushes further into the solar system, the potable supply challenges we face today will only grow. In their efforts to ensure humanity has enough to drink, some of NASA’s cutting-edge in-orbit water recycling research is coming back down to Earth.
On Earth
In California, for example, the four billion gallons of wastewater generated daily from the state’s homes and businesses, storm drain and roof-connected runoff, makes its way through more than 100,000 miles of sewer lines where it — barring obstructionist fatbergs — eventually ends up at one of the state’s 900 wastewater treatment plants. How that water is processed depends on whether it’s destined for human consumption or non-potable uses like agricultural irrigation, wetland enhancement and groundwater replenishment.
The city of Los Angeles takes a multi-step approach to reclaiming its potable wastewater. Large solids are first strained from incoming fluids using mechanical screens at the treatment plant’s headworks. From there, the wastewater flows into a settling tank where most of the remaining solids are removed — sludged off to anaerobic digesters after sinking to the bottom of the pool. The water is then sent to secondary processing where it is aerated with nitrogen-fixing bacteria before being pushed into another settling, or clarifying, tank. Finally it’s filtered through a tertiary cleaning stage of cationic polymer filters where any remaining solids are removed. By 2035, LA plans to recycle all of its wastewater for potable reuse while Aurora, Colorado, and Atlanta, Georgia, have both already begun augmenting their drinking water supplies with potable reuse.
“There are additional benefits beyond a secure water supply. If you're not relying on importing water, that means there's more water for ecosystems in northern California or Colorado,” Stanford professor William Mitch, said in a recent Stanford Engineering post. “You're cleaning up the wastewater, and therefore you're not discharging wastewater and potential contaminants to California's beaches.”
Wastewater treatment plants in California face a number of challenges, the Water Education Foundation notes, including aging infrastructure; contamination from improperly disposed pharmaceuticals and pesticide runoff; population demands combined with reduced flows due to climate change-induced drought. However their ability to deliver pristine water actually outperforms nature.
“We expected that potable reuse waters would be cleaner, in some cases, than conventional drinking water due to the fact that much more extensive treatment is conducted for them,” Mitch argued in an October study in Nature Sustainability. “But we were surprised that in some cases the quality of the reuse water, particularly the reverse-osmosis-treated waters, was comparable to groundwater, which is traditionally considered the highest quality water.”
The solids pulled from wastewater are also heavily treated during recycling. The junk from the first stage is sent to local landfills, while the biological solids strained from the second and third stages are sent to anaerobic chambers where their decomposition generates biogas that can be burned for electrical production and converted to nitrogen-rich fertilizer for agricultural use.
New York, for example, produces 22,746 tons of wastewater sludge per day from its 1,200-plus statewide wastewater treatment plants (WWTPs). However, less than a tenth of plants (116 specifically) actually use that sludge to produce biogas, per a 2021 report from the Rockefeller Institute for Government, and is “mainly utilized to fuel the facilities and for the combined heat and power generation of the WWTPs.”
“Increasing pressures on water resources have led to greater water scarcity and a growing demand for alternative water sources,” the Environmental Protection Agency points out. “Onsite non-potable water reuse is one solution that can help communities reclaim, recycle, and then reuse water for non-drinking water purposes.”
In Orbit
Aboard the ISS, astronauts have even less leeway in their water use on account of the station being a closed-loop system isolated in space. Also because SpaceX charges $2,500 per pound of cargo (after the first 440 pounds, for which it charges $1.1 million) to send into orbit on one of its rockets — and liquid water is heavy.
ESA
While the ISS does get the occasional shipment of water in the form of 90-pound duffle bag-shaped Contingency Water Containers to replace what’s invariably lost to space, its inhabitants rely on the complicated web of levers and tubes you see above and below to reclaim every dram of moisture possible and process it into potability. The station’s Water Processing Assembly can produce up to 36 gallons of drinkable water every day from the crew’s sweat, breath and urine. When it was installed in 2008, the station’s water delivery needs dropped by around 1,600 gallons, weighing 15,960 pounds. It works in conjunction with the Urine Processor Assembly (UPA), Oxygen Generation Assembly (OGA), Sabatier reactor (which recombines free oxygen and hydrogen split by the OGA back into water) and Regenerative Environmental Control and Life Support Systems (ECLSS) systems to maintain the station’s “water balance” and supply American astronauts with a minimum of 2.5 liters of water each day. Cosmonauts in the Russian segment of the ISS rely on a separate filtration system that only collects shower runoff and condensation and therefore require more regular water deliveries to keep their tanks topped off.
ESA
In 2017, NASA upgraded the WPA with a new reverse-osmosis filter in order to, “reduce the resupply mass of the WPA Multi-filtration Bed and improved catalyst for the WPA Catalytic Reactor to reduce the operational temperature and pressure,” the agency announced that year. “Though the WRS [water recovery system] has performed well since operations began in November 2008, several modifications have been identified to improve the overall system performance. These modifications aim to reduce resupply and improve overall system reliability, which is beneficial for the ongoing ISS mission as well as for future NASA manned missions.”
One such improvement is the upgraded Brine Processor Assembly (BPA) delivered in 2021, a filter that sieves more salt out of astronaut urine to produce more reclaimed water than its predecessor. But there is still a long way to go before we can securely transport crews through interplanetary space. NASA notes that the WPA that got delivered in 2008 was originally rated to recover 85 percent of the water in crew urine though its performance has since improved to 87 percent.
NASA
“To leave low-Earth orbit and enable long-duration exploration far from Earth, we need to close the water loop,” Caitlin Meyer, deputy project manager for Advanced Exploration Systems Life Support Systems at NASA’s Johnson Space Center in Houston, added. “Current urine water recovery systems utilize distillation, which produces a brine. The [BPA] will accept that water-containing effluent and extract the remaining water.”
When the post-processed urine is then mixed with reclaimed condensation and runs through the WPA again, “our overall water recovery is about 93.5 percent,” Layne Carter, International Space Station Water Subsystem Manager at Marshall, said in 2021. To safely get to Mars, NASA figures it needs a reclamation rate of 98 percent or better.
But even if the ISS’s current state-of-the-art recycling technology isn’t quite enough to get us to Mars, it’s already making an impact planetside. For example, in the early 2000’s the Argonide company developed a “NanoCeram” nanofiber water filtration system with NASA small business funding support. The filter uses positively charged microscopic alumina fibers to remove virtually all contaminants without overly restricting flow rate, eventually spawning the Oas shower from Orbital Systems.
“The shower starts with less than a gallon of water and circulates it at a rate of three to four gallons per minute, more flow than most conventional showers provide,” NASA noted last July. “The system checks water quality 20 times per second, and the most highly polluted water, such as shampoo rinse, is jettisoned and replaced. The rest goes through the NanoCeram filter and then is bombarded with ultraviolet light before being recirculated.” According to the Swedish Institute for Communicable Disease Control, the resulting water is cleaner than tap.
Google has announced a new water stewardship target that will see the company commit to replenishing on average 120 percent of the water it consumes at its data centers and offices by 2030. To that end, the search giant says it will use freshwater alternatives to cool its server farms. In places like Douglas County, Georgia, the company already uses reclaimed wastewater to keep its servers running. Moving forward, it will work to double down on that practice by finding more opportunities to use wastewater and seawater.
At its offices, meanwhile, the company plans to use more on-site water sources, such as collected stormwater, for things like landscape irrigation and toilet flushing that don't require potable water. Google points to its Bay Area campuses and a landscaping project where it worked with local ecologists as an example of an initiative where it's already thinking about its water use.
"Our water stewardship journey will involve continuously enhancing our water use and consumption," said Google sustainability officer Kate Brandt in a blog post.
In its efforts to replenish more water than it consumes, the company says it will also invest in community projects working to address local water and watershed challenges in places where the company has data centers and offices. As an example of the work Google plans to do here, the company points to a partnership it already has in place with the Colorado River Indian Tribes to reduce the amount of water removed from Lake Mead. The reservoir, the largest in the US, faces a pressing water shortage due to a combination of overuse and extended drought.
Lastly, the company plans to continue working with communities, policymakers and planners to help them with tools and technologies they need to measure and predict water availability and needs. Here, the company references work it did with the United Nations Environment Programme to create the Freshwater Ecosystems Explorer. It's a tool that tracks national and local surface water changes over time.
Today's commitment comes after Alphabet CEO Sundar Pichai announced the company would attempt to run all of its data centers and offices entirely on carbon-free energy by 2030. Pichai described the effort as a "moonshot," noting it would be tricky in some instances to achieve due to the remote location of some of Google's facilities.
Google has announced a new water stewardship target that will see the company commit to replenishing on average 120 percent of the water it consumes at its data centers and offices by 2030. To that end, the search giant says it will use freshwater alternatives to cool its server farms. In places like Douglas County, Georgia, the company already uses reclaimed wastewater to keep its servers running. Moving forward, it will work to double down on that practice by finding more opportunities to use wastewater and seawater.
At its offices, meanwhile, the company plans to use more on-site water sources, such as collected stormwater, for things like landscape irrigation and toilet flushing that don't require potable water. Google points to its Bay Area campuses and a landscaping project where it worked with local ecologists as an example of an initiative where it's already thinking about its water use.
"Our water stewardship journey will involve continuously enhancing our water use and consumption," said Google sustainability officer Kate Brandt in a blog post.
In its efforts to replenish more water than it consumes, the company says it will also invest in community projects working to address local water and watershed challenges in places where the company has data centers and offices. As an example of the work Google plans to do here, the company points to a partnership it already has in place with the Colorado River Indian Tribes to reduce the amount of water removed from Lake Mead. The reservoir, the largest in the US, faces a pressing water shortage due to a combination of overuse and extended drought.
Lastly, the company plans to continue working with communities, policymakers and planners to help them with tools and technologies they need to measure and predict water availability and needs. Here, the company references work it did with the United Nations Environment Programme to create the Freshwater Ecosystems Explorer. It's a tool that tracks national and local surface water changes over time.
Today's commitment comes after Alphabet CEO Sundar Pichai announced the company would attempt to run all of its data centers and offices entirely on carbon-free energy by 2030. Pichai described the effort as a "moonshot," noting it would be tricky in some instances to achieve due to the remote location of some of Google's facilities.
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