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Unveiling magmatic structures and connectivity beneath the lunar Oceanus Procellarum region from GRAIL gravity data.
Nat Commun
November 2024
School of Earth, Environment and Society, McMaster University, Hamilton, ON, Canada.
The Oceanus Procellarum region, characterized by its vast basaltic plains and pronounced volcanic activity, serves as a focal point for understanding the volcanic history of the Moon. Here we present density models of the magmatic structures beneath Oceanus Procellarum, derived from Gravity Recovery and Interior Laboratory (GRAIL) mission data. The models uncover pronounced linear magmatic structures along the Procellarum's western border and significant intrusions within the northern and southern Marius Hills.
View Article and Find Full Text PDFImpact of microgravity and lunar gravity on murine skeletal and immune systems during space travel.
Sci Rep
November 2024
Laboratory Animal Resource Center in Transborder Medical Research Center, and Department of Anatomy and Embryology, Institute of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
Article Synopsis
- Long-duration spaceflight can stress the skeletal and immune systems, but the specific response mechanisms are still not fully understood.
- A study with mice on the ISS evaluated how different gravitational conditions (microgravity, lunar gravity, and Earth gravity) affected their bone, thymus, and spleen over 25-35 days.
- Results showed that while bone density loss in microgravity was mostly restored in Earth gravity, lunar gravity only offered partial recovery; microgravity also caused thymus shrinkage, partially reversible by both lunar and Earth gravity but with ongoing gene expression issues.
A rotational ellipsoid model for solid Earth tide with high precision.
Sci Rep
November 2024
National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, China.
Solid Earth tide represents the response of solid Earth to the lunar (solar) gravitational force. The yielding solid Earth due to the force has been thought to be a prolate ellipsoid since the time of Lord Kelvin, yet the ellipsoid's geometry such as major semi-axis's length, minor semi-axis's length, and flattening remains unresolved. Additionally, the tidal displacement of reference point is conventionally resolved through a combination of expanded potential equations and given Earth model.
View Article and Find Full Text PDFHydroponics for plant cultivation in space - a white paper.
Life Sci Space Res (Amst)
November 2024
Biology Department, University of Louisiana at Lafayette, Lafayette, LA 70503, USA.
The microgravity conditions experienced in space prevent the proper distribution of water throughout root modules of plant growth hardware, and the lack of convective mixing and buoyancy reduces gas exchange. To overcome this problem, cultivation technologies should be designed that take advantage of the unique traits of the spaceflight environment instead of attempting to recreate Earth-like conditions. Such technologies should be adaptable to both the microgravity of spaceflight and the low gravity environments of the lunar and Martian surface.
View Article and Find Full Text PDFDark Age Consistency in the 21 cm Global Signal.
Phys Rev Lett
September 2024
Mizusawa VLBI Observatory, National Astronomical Observatory Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.
Article Synopsis
- The "dark age consistency ratio" is a proposed new observable for studying the 21 cm global signal during the universe's dark ages, aimed at testing models beyond the standard ΛCDM cosmological model.
- This ratio is based on the idea that the shape of the 21 cm signal's frequency response is largely unaffected by cosmological parameters in the ΛCDM framework, yielding a specific value that can help distinguish between models.
- The observable only requires brightness temperature measurements at a few frequency bands, making it feasible to evaluate cosmological theories even with limited data from upcoming lunar telescope missions.
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