Building a space station on the Moon might seem like something out of a science fiction movie, but each new lunar mission is bringing that idea closer to reality. Scientists are homing in on potential lunar ice reservoirs in permanently shadowed regions, or PSRs. These are key to setting up any sort of sustainable lunar infrastructure.

In late August 2023, India’s Chandrayaan-3 lander touched down on the lunar surface in the south polar region, which scientists suspect may harbor ice. This landing marked a significant milestone not only for India but for the scientific community at large.

For planetary scientists like me, measurements from instruments onboard Chandrayaan-3’s Vikram lander and its small, six-wheeled rover Pragyan provide a tantalizing up-close glimpse of the parts of the Moon most likely to contain ice. Earlier observations have shown ice is present in some permanently shadowed regions, but estimates vary widely regarding the amount, form and distribution of these ice deposits.

Polar ice deposits

My team at the Laboratory for Atmospheric and Space Physics has a goal of understanding where water on the Moon came from. Comets or asteroids crashing into the Moon are options, as are volcanic activity and solar wind.

Each of these events leaves behind a distinctive chemical fingerprint, so if we can see those fingerprints, we might be able to trace them to the source of water. For example, sulfur is expected in higher amounts in lunar ice deposits if volcanic activity rather than comets created the ice.

Like water, sulfur is a “volatile” element on the Moon, because on the lunar surface it’s not very stable. It’s easily vaporized and lost to space. Given its temperamental nature, sulfur is expected to accumulate only in the colder parts of the Moon.

While the Vikram lander didn’t land in a permanently shadowed region, it measured the temperature at a high southern latitude of 69.37°S and was able to identify sulfur in soil grains on the lunar surface. The sulfur measurement is intriguing because sulfur may point toward the source of the Moon’s water.

So, scientists can use temperature as a way of finding where volatiles like these may end up. Temperature measurements from Chandrayaan-3 could allow scientists to test models of volatile stability and figure out how recently the sulfur may have accumulated at the landing site.

Tools for discovery

Vikram and Pragyan are the newest in a series of spacecraft that have helped scientists study water on the Moon. NASA’s Lunar Reconnaissance Orbiter launched in 2009 and has spent the past several years observing the Moon from orbit. I’m a co-investigator on LRO, and I use its data to study the distribution, form and abundance of water on the lunar poles.

Both India’s Chandrayaan-1 orbiter and LRO have allowed my colleagues and me to use ultraviolet and near-infrared observations to identify ice in the permanently shadowed regions by measuring the chemical fingerprints of water. We’ve definitively detected water ice in some of these regions inside the coldest shadows at the lunar poles, but we’re still not sure why the ice isn’t more widespread.

On Mercury, by contrast, the permanently shadowed regions are practically overflowing with ice. For several years, scientists have recognized the need to get down on the surface and make more detailed measurements of lunar volatiles. With its sulfur detections, the Vikram lander has now taken the first tentative steps as part of a larger exploration program.

Future lunar missions

NASA has its sights set on the lunar south pole. Leading up to the Artemis III mission to deploy astronauts to investigate ice on the surface, the Commercial Lunar Payloads Services program will send multiple landers and rovers to search for ice starting later in 2023.

While uncertainty surrounds the timeline of Artemis launches, the first crewed mission, Artemis II, is on track for a late 2024 or early 2025 launch, with a looping trajectory passing behind the Moon’s far side and back to Earth.

The Lunar Compact Infrared Imaging System, of which I’m the principal investigator, is an infrared camera that will take temperature measurements and study the surface composition of the Moon.

Dubbed L-CIRiS, this camera recently underwent its final review before delivery to NASA, and the completed flight instrument will be prepared to launch on a commercial lander in late 2026.

Prior to L-CIRiS, the VIPER rover mission is planned to launch in late 2024 to the lunar south polar region, where it will carry instruments to search for ice in micro-cold traps. These tiny shadows, some no larger than a penny, are hypothesized to contain a significant amount of water and are more accessible than the larger PSRs.

One long-term goal of L-CIRiS and NASA’s Commercial Lunar Payload Services program is to find a suitable place for a long-term, sustainable lunar station. Astronauts could stay at this station, potentially similar to the one at McMurdo station in Antarctica, but it would need to be somewhat self-sufficient to be economically viable. Water is extremely expensive to ship to the Moon, hence locating the station near ice reservoirs is a must.

During the Artemis III mission, NASA astronauts will use the information gathered by the Commercial Lunar Payload Services program and other missions, including Chandrayaan-3, to assess the best locations to collect samples. Chandrayaan-3 and L-CIRiS’s measurements of temperature and composition are like those that will be needed for Artemis to succeed. Cooperation among space agencies young and old is thus becoming a key feature of a long-term, sustainable human presence on the Moon.

Paul Hayne, Assistant Professor of Astrophysical and Planetary Sciences, University of Colorado Boulder

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Imagine you’re a farmer searching for eggs in the chicken coop – but instead of a chicken egg, you find an ostrich egg, much larger than anything a chicken could lay.

That’s a little how our team of astronomers felt when we discovered a massive planet, more than 13 times heavier than Earth, around a cool, dim red star, nine times less massive than Earth’s Sun, earlier this year.

The smaller star, called an M star, is not only smaller than the Sun in Earth’s solar system, but it’s 100 times less luminous. Such a star should not have the necessary amount of material in its planet-forming disk to birth such a massive planet.

The Habitable Zone Planet Finder

Over the past decade, our team designed and built a new instrument at Penn State capable of detecting the light from these dim, cool stars at wavelengths beyond the sensitivity of the human eye – in the near-infrared – where such cool stars emit most of their light.

Attached to the 10-meter Hobby-Eberly Telescope in West Texas, our instrument, dubbed the Habitable Zone Planet Finder, can measure the subtle change in a star’s velocity as a planet gravitationally tugs on it. This technique, called the Doppler radial velocity technique, is great for detecting exoplanets.

“Exoplanet” is a combination of the words extrasolar and planet, so the term applies to any planet-sized body in orbit around a star that isn’t Earth’s Sun.

Thirty years ago, Doppler radial velocity observations enabled the discovery of 51 Pegasi b, the first known exoplanet orbiting a Sunlike star. In the ensuing decades, astronomers like us have improved this technique. These increasingly more precise measurements have an important goal: to enable the discovery of rocky planets in habitable zones, the regions around stars where liquid water can be sustained on the planetary surface.

The Doppler technique doesn’t yet have the capabilities to discover habitable zone planets the mass of the Earth around stars the size of the Sun. But the cool and dim M stars show a larger Doppler signature for the same Earth-size planet. The lower mass of the star leads to it getting tugged more by the orbiting planet. And the lower luminosity leads to a closer-in habitable zone and a shorter orbit, which also makes the planet easier to detect.

Planets around these smaller stars were the planets our team designed the Habitable Zone Planet Finder to discover. Our new discovery, published in the journal Science, of a massive planet orbiting closely around the cool dim M star LHS 3154 – the ostrich egg in the chicken coop – came as a real surprise.

LHS 3154b: The planet that should not exist

Planets form in disks composed of gas and dust. These disks pull together dust grains that grow into pebbles and eventually combine to form a solid planetary core. Once the core is formed, the planet can gravitationally pull in the solid dust, as well as surrounding gas such as hydrogen and helium. But it needs a lot of mass and materials to do this successfully. This way to form planets is called core accretion.

A star as low mass as LHS 3154, nine times less massive than the Sun, should have a correspondingly low-mass planet forming disk.

A typical disk around such a low-mass star should simply not have enough solid materials or mass to be able to make a core heavy enough to create such a planet. From computer simulations our team conducted, we concluded that such a planet needs a disk at least 10 times more massive than typically assumed from direct observations of planet-forming disks.

A different planet formation theory, gravitational instability – where gas and dust in the disk undergo a direct collapse to form a planet – also struggles to explain the formation of such a planet without a very massive disk.

Planets around the most common stars

Cool, dim M stars are the most common stars in our galaxy. In DC comics lore, Superman’s home world, planet Krypton, orbited an M dwarf star.

Astronomers know, from discoveries made with Habitable Zone Planet Finder and other instruments, that giant planets in close-in orbits around the most massive M stars are at least 10 times rarer than those around Sunlike stars. And we know of no such massive planets in close orbits around the least massive M stars – until the discovery of LHS 3154b.

Understanding how planets form around our coolest neighbors will help us understand both how planets form in general and how rocky worlds around the most numerous types of stars form and evolve. This line of research could also help astronomers understand whether M stars are capable of supporting life.

Suvrath Mahadevan, Verne M. Willaman Professor of Astronomy & Astrophysics, Penn State; Guðmundur Kári Stefánsson, NASA Hubble Fellow, Department of Astrophysical Sciences, Princeton University, and Megan Delamer, Graduate Student, Department of Astronomy, Penn State

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Adults who faced adversity during childhood were significantly more likely to die from or be hospitalized because of COVID-19. That’s the key finding of my team’s recent study, published in the Journal of Epidemiology and Community Health.

The study of 150,000 adults in the United Kingdom found those reporting the most childhood trauma had a 25% greater likelihood of death associated with COVID-19, as well as a 22% increase in hospitalization after contracting COVID-19. These figures held up even after accounting for demographics and health conditions.

Childhood trauma includes physical, emotional or sexual abuse, neglect, household dysfunction and what many call “toxic stress.”

Our study relied on the UK Biobank, a large biomedical database with more than 500,000 volunteers ages 40 to 69 throughout the United Kingdom. Close to one-third of those volunteers provided information about their childhood. Our team took that data and then searched medical records for participants who died or were hospitalized because of COVID-19. Though more research is needed, these initial results highlight the lasting impacts of childhood stress and the need to provide psychological support early on to mitigate lifelong health risks.

Why it matters

COVID-19 had killed nearly 7 million people worldwide as of November 2023. This underscores the importance of understanding all of the risk factors leading to pandemic-related hospitalization and death.

Prior research has examined the demographic risk factors for COVID-19, including age, race, ethnicity, income and education. But this is the first study to link childhood experiences to adult COVID-19 outcomes.

The striking findings of the study suggest that early childhood trauma should be added to the list of risk factors for illness – not only for COVID-19 but perhaps for other diseases as well.

The study also suggests that communities disproportionately affected by adversity and trauma may be particularly vulnerable to negative health outcomes. This includes communities where there are high levels of neighborhood violence, stress and poverty.

What other research is being done

Our research was prompted by a growing body of work that has found an association between adverse childhood experiences and health problems in adulthood. Adults experiencing significant childhood abuse have an increased risk for chronic conditions, including heart disease, lung disease, cancer and premature death.

Researchers are still trying to understand how childhood adversity contributes to negative health outcomes in adulthood. It could be primarily biological in nature. For instance, adversity has been linked to excess inflammation. Inflammation is normally a protective response from the body, triggered by harmful stimuli such as pathogens, damaged cells or toxins. However, excessive inflammation is related to strokes, heart attacks and other health conditions and can lead to more negative COVID-19 outcomes.

In contrast, the links between early adversity and poorer health could be behavioral in nature. Adversity is associated with having less money or education as an adult. These factors could, in turn, be associated with less access to and subpar medical care. Studies have shown that people with lower incomes and lower-paying jobs were exposed to COVID-19 in the workplace more often. Adversity is also associated with depression and challenges to emotion regulation. This in turn could result in downstream changes in biology and behavior.

What’s next

Our team plans to continue investigating large population studies – that is, at least 30,000 to 50,000 participants – to determine whether adverse childhood experiences relate to other health outcomes, like long COVID.

It’s becoming increasingly clear that learning more about how childhood trauma becomes embedded in the body could inform our understanding of possible interventions and long-term health outcomes, including those potentially connected to COVID-19.

The Research Brief is a short take on interesting academic work.

Jamie Hanson, Assistant Professor of Psychology, University of Pittsburgh

This article is republished from The Conversation under a Creative Commons license. Read the original article.