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By NASA
3 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
AS16-116-18653 (23 April 1972) — Astronaut Charles M. Duke Jr., Apollo 16 lunar module pilot, stands at a big rock adjacent (south) to the huge “House Rock” (barely out of view at right edge). Note shadow at extreme right center where the two moon-exploring crew members of the mission sampled what they referred to as the “east-by-west split of House Rock” or the open space between this rock and “House Rock”. At their post-mission press conference, the crewmen expressed the opinion that this rock was once a part of “House Rock” which had broken away. The two sampled the big boulder seen here also. Duke has a sample bag in his hand, and a lunar surface rake leans against the large boulder. Astronaut John W. Young, commander, exposed this view with a color magazine in his 70mm Hasselblad camera. While astronauts Young and Duke descended in the Apollo 16 Lunar Module (LM) “Orion” to explore the Descartes highlands landing site on the moon, astronaut Thomas K. Mattingly II, command module pilot, remained with the Command and Service Modules (CSM) “Casper” in lunar orbit.NASA The goals of the working group were to:
Endorse or recommend changes to H2S SMAC levels that had been proposed by the JSC Toxicology Laboratory Review a draft H2S SMAC manuscript prepared by the JSC Toxicology Laboratory Provide any additional insight and consideration regarding H2S toxicity that should be considered for spaceflight programs Background
The NASA Spaceflight Human-System Standard (NASA-STD-3001) establishes that vehicle systems shall limit atmospheric contamination below established limits [V2 6050] Atmosphere Contamination Limit. The JSC Toxicology Laboratory maintains the JSC 20584 Spacecraft Maximum Allowable Concentrations for Airborne Contaminants document, which contains a table of SMAC values for a variety of chemicals including carbon monoxide, ammonia, heavy metals, and a wide range of volatile organic compounds. SMACs are documented for 1-hr, 24-hr, 7-day, 30-day, 180-day, and 1000-day time spans for each chemical, and express the maximum concentration to which spaceflight crew can be exposed for that duration.
Read More The organ system that is affected as well as the effect (symptoms) are also documented for each SMAC. For more information on SMACs, see this article Exposure Guidelines (SMACs and SWEGs) – NASA and the OCHMO Spaceflight Toxicology technical brief technical brief.
Read More A SMAC value for hydrogen sulfide has not previously been established since it has not been of concern in spacecraft. However, with Artemis missions returning to the moon there is a possibility that H2S could be released within spacecraft during lunar sample return, given that this compound may be a component of lunar polar ice. H2S has an intense smell of rotten eggs and therefore has a distracting psychological element. Physiologically it has been shown to be an irritant at low concentrations and in high concentrations can potentially lead to neurological effects and unconsciousness.
Hydrogen sulfide SMAC values will define safe limits for spaceflight crews on future missions and could drive new requirements for monitoring and mitigation of this chemical during spaceflight.
Read More Conclusions
Key points of the review were:
The proposed 1-hour, 24-hour, 7-day, 30-day, and 180-day SMAC values were deemed appropriate and were endorsed by each of the panel members. The proposed 1000-day SMAC value is so low that the panel’s opinion is that this SMAC may not be attainable due to human-generated sources, and that these concentrations do not represent a true toxicological risk. The recommendation is to eliminate the 1000-day SMAC, or to call it a guideline. The general SMAC calculation approach and inclusion of safety factors is logical, although some additional rationale would be justified. Interactive and additive effects with other substances are considered negligible, particularly at these low concentrations. Microgravity-induced physiological changes are unlikely to exacerbate hydrogen sulfide exposure at these low concentrations. Recommendations were made with the understanding that these SMACs apply to pre-screened, healthy astronauts. For private spaceflight participants who may not be as well screened, the panel recommended individual physician attention and a review of all SMACs (including hydrogen sulfide), to identify sensitivities in certain populations (existing disease states, etc.). Passive dosimetry technology is available and should be considered for long-term monitoring at these low concentrations. Following consideration of the panel’s recommendation, the NASA/TM-20240000101 Exposure Limits for Hydrogen Sulfide in Spaceflight was revised and released by the JSC toxicology group in January of 2024 and is available below.
Read More Astronaut Woody Hoburg replaces life support system components inside the International Space Station’s Destiny laboratory module.NASA About the Author
Kim Lowe
Human Systems Standards Integrator
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Last Updated Jan 17, 2025 Related Terms
Office of the Chief Health and Medical Officer (OCHMO) Human Health and Performance Humans in Space The Human Body in Space Keep Exploring Discover More Topics From OCHMO Standards
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By NASA
This artist’s illustration represents the results from a new study that examines the effects of X-ray and other high-energy radiation unleashed on potential exoplanets from Wolf 359, a nearby red dwarf star. Researchers used Chandra and XMM-Newton to study the impact of steady X-ray and energetic ultraviolet radiation from Wolf 359 on the atmospheres of planets that might be orbiting the star. They found that only a planet with greenhouse gases like carbon dioxide in its atmosphere and at a relatively large distance away from Wolf 359 would have a chance to support life as we know it.X-ray: NASA/CXC/SAO/S.Wolk, et al.; Illustration: NASA/CXC/SAO/M.Weiss; Image processing: NASA/CXC/SAO/N. Wolk Planets around other stars need to be prepared for extreme weather conditions, according to a new study from NASA’s Chandra X-ray Observatory and ESA’s (European Space Agency’s) XMM-Newton that examined the effects of X-rays on potential planets around the most common type of stars.
Astronomers found that only a planet with greenhouse gases in its atmosphere like Earth and at a relatively large distance away from the star they studied would have a chance to support life as we know it around a nearby star.
Wolf 359 is a red dwarf with a mass about a tenth that of the Sun. Red dwarf stars are the most common stars in the universe and live for billions of years, providing ample time for life to develop. At a distance of only 7.8 light-years away, Wolf 359 is also one of the closest stars to the solar system.
“Wolf 359 can help us unlock the secrets around stars and habitability,” said Scott Wolk of the Center for Astrophysics | Harvard & Smithsonian (CfA), who led the study. “It’s so close and it belongs to such an important class of stars – it’s a great combination.”
Because red dwarfs are the most prevalent types of stars, astronomers have looked hard to find exoplanets around them. Astronomers have found some evidence for two planets in orbit around Wolf 359 using optical telescopes, but those conclusions have been challenged by other scientists.
“While we don’t have proof of planets around Wolf 359 yet, it seems very possible that it hosts multiple planets,” Wolk added. “This makes it an excellent test bed to look at what planets would experience around this kind of star.”
Wolk and his colleagues used Chandra and XMM to study the amounts of steady X-rays and extreme ultraviolet (UV) radiation – the most energetic type of UV radiation – that Wolf 359 would unleash on the possible planets around it.
They found that Wolf 359 is producing enough damaging radiation that only a planet with greenhouse gases like carbon dioxide in its atmosphere – and located at a relatively large distance from the star – would likely be able to sustain life.
“Just being far enough away from the star’s harmful radiation wouldn’t be enough to make it habitable,” said co-author Vinay Kashyap, also of CfA. “A planet around Wolf 359 would also need to be blanketed in greenhouse gases like Earth is.”
To study the effects of energetic radiation on the habitability of the planet candidates, the team considered the star’s habitable zone – the region around a star where liquid water could exist on a planet’s surface.
The outer limit of the habitable zone for Wolf 359 is about 15% of the distance between Earth and the Sun, because the red dwarf is much less bright than the Sun. Neither of the planet candidates for this system is located in Wolf 359’s habitable zone, with one too close to the star and the other too far out.
“If the inner planet is there, the X-ray and extreme UV radiation it is subjected to would destroy the atmosphere of this planet in only about a million years,” said co-author Ignazio Pillitteri of CfA and the National Institute for Astrophysics in Palermo, Italy.
The team also considered the effects of radiation on as-yet undetected planets within the habitable zone. They concluded that a planet like the Earth in the middle of the habitable zone should be able to sustain an atmosphere for almost two billion years, while one near the outer edge could last indefinitely, helped by the warming effects of greenhouse gases.
Another big danger for planets orbiting stars like Wolf 359 is from X-ray flares, or occasional bright bursts of X-rays, on top of the steady, everyday output from the star. Combining observations made with Chandra and XMM-Newton resulted in the discovery of 18 X-ray flares from Wolf 359 over 3.5 days.
Extrapolating from these observed flares, the team expects that much more powerful and damaging flares would occur over longer periods of time. The combined effects of the steady X-ray and UV radiation and the flares mean that any planet located in the habitable zone is unlikely to have a significant atmosphere long enough for multicellular life, as we know it on Earth, to form and survive. The exception is the habitable zone’s outer edge if the planet has a significant greenhouse effect.
These results were presented at the 245th meeting of the American Astronomical Society in National Harbor, Maryland, and are being prepared for publication in a journal. NASA’s Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.
Read more from NASA’s Chandra X-ray Observatory.
Learn more about the Chandra X-ray Observatory and its mission here:
https://www.nasa.gov/chandra
https://chandra.si.edu
News Media Contact
Megan Watzke
Chandra X-ray Center
Cambridge, Mass.
617-496-7998
mwatzke@cfa.harvard.edu
Lane Figueroa
Marshall Space Flight Center, Huntsville, Alabama
256-544-0034
lane.e.figueroa@nasa.gov
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By Space Force
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By Space Force
The Space Force Year in Review is a collection of photos that showcase the men and women of the U.S. Space Force participating in activities and operations necessary to develop and protect U.S. interests in space.
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By NASA
On Dec. 19, 2024, NASA released two amendments to the NASA Research Announcement Research Opportunities in Space and Earth Sciences (ROSES) 2024 (NNH24ZDA001N) to announce the E.9 Space Biology: Research Studies and E.12 Physical Sciences Research Studies program elements.
Space Biology Proposals
The research emphases of E.9 Space Biology: Research Studies fall under two broad categories: Precision Health and Space Crops
For Precision Health-focused studies, investigators may propose to use any non-primate animal model system and any appropriate cell/tissue culture/microphysiological system/organoid or microbial models that are supported by the chosen platform. For Space Crop-focused studies, applicants may propose to use any plant, relevant microbe, and/or plant and microbe model system(s) that is (are) supported by the chosen platform. The E.9 Space Biology: Research Studies opportunity includes five different Project Types: Research Investigations, Early Career Research Investigations, New NASA Investigators, OSDR Analytical Investigations, and Tissue Sharing Investigations. Specific requirements for each of these Project Types are described in the program element text. Questions concerning E.9 Space Biology: Research Studies may be directed to Lynn Harrison (for Precision Health) and Elison Blancaflor (for Space Crops) at nasa-spacebiology@mail.nasa.gov.
Physical Sciences Proposals
E.12 Physical Sciences: Research Studies solicits proposals to investigate physical phenomena in the absence of gravity and fundamental laws that describe the universe, and applied research that contributes to the basic understanding of processes underlying space exploration technologies.
The Physical Sciences program is divided into two key goals: Foundations and Quantum Leaps. Foundations focuses on understanding the behavior of fluids, combustion, soft matter, and materials in the spaceflight environment. Quantum Leaps aims to probe the very nature of the universe using exquisitely precise space-based quantum sensors to test the Einstein equivalence principle, dark sector physics, and the nature of fundamental physical constants.
The E.12 Physical Sciences: Research Studies opportunity will include four different Project Types: Research Investigations, New NASA Investigators, Physical Sciences Informatics, and Fundamental Physics Investigations. Specific requirements for each of these Project Types are described in detail in the program element text. Questions concerning E.12 Physical Sciences Research Studies may be directed to Brad Carpenter (regarding Foundations and PSI) or Mike Robinson (regarding Quantum Leaps) by writing to BPS-PhysicalSciences@nasaprs.com.
Town Hall
A pre-proposer’s townhall for applicants interested in submitting a proposal to these program elements will be held virtually on Jan. 22, 2025, at 3 p.m. Eastern Time. Meeting information will be posted on the NSPIRES page for each of the program elements under “Other Documents.”
Proposals to these program elements shall be submitted via a two-step process
Step-1 proposals must be submitted by Feb. 4, 2025 Step-2 proposals are due on May 6, 2025 Related Resources:
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