Tag

Gravity

All articles tagged with #gravity

space14 days ago•6 min saved

WISPIT 2: A Young Solar System Taking Shape

Astronomers directly observed two planets forming around the very young star WISPIT 2, about 437 light-years away. A distant giant, WISPIT 2b, sits at 57 AU with ~5 Jupiter masses, while a closer planet, WISPIT 2c, lies at 14 AU with 8–12 Jupiter masses. The system’s disk shows multiple rings and gaps, hinting at a possible third planet and offering a rare glimpse into how our Solar System may have formed; future imaging with the Extremely Large Telescope could reveal more.

via Indian Defence Review|

#exoplanets #gravity #planet-formation

space15 days ago•4 min saved

Mice on the ISS Map a Path to Keeping Humans Fit on Mars

Researchers aboard the ISS exposed 24 mice to varying gravity levels (microgravity, 0.33 g, 0.67 g, and 1 g) to mimic Mars’ gravity, uncovering muscle changes and blood biomarkers that could help monitor astronauts’ muscle health on long Mars missions.

via The Daily Galaxy|

#biomarkers #gravity #mars

space18 days ago•6 min saved

Martian Gravity Thresholds: 0.67 g May Preserve Astronaut Muscles

An international study using mice aboard JAXA's centrifuge simulated Martian gravity (0.33 g, 0.67 g, and 1 g) and found that 0.33 g mitigates spaceflight-induced muscle loss while 0.67 g fully preserves muscle performance, suggesting partial gravity during Mars missions could help maintain astronauts' muscle health; researchers also identified 11 metabolites as potential biomarkers of physiological adaptation.

via ScienceAlert|

#biomarkers #gravity #mars

science26 days ago•4 min saved

Space Gravity Threshold: 0.67 g Keeps Mice’s Muscles Strong in Orbit

NASA/JAXA researchers studied 24 mice aboard the ISS under four gravity levels (microgravity, 0.33 g, 0.67 g, and 1 g) and found that muscle strength declines when gravity falls below 0.67 g even if muscle size stays the same; the soleus muscle is particularly gravity-sensitive. At 0.67 g, grip strength remains near Earth-normal, but it weakens below that threshold. The results suggest Mars’ 0.38 g environment may not by itself preserve muscle during long missions, underscoring the need for exercise or other countermeasures, with translation to humans to be determined by further research.

via The Daily Galaxy|

#gravity #mars #muscle

earth-and-climate1 month ago•6 min saved

Antarctica’s Hidden Gravity Hole Points to Deep-Earth Roots of Its Ice Sheets

Scientists mapped a gravity low beneath Antarctica caused by extremely slow deep-Earth rock movements over tens of millions of years. The anomaly strengthened between about 50 and 30 million years ago, coinciding with the emergence of Antarctica’s vast ice sheets, suggesting mantle dynamics may have helped shape surface ice and sea level. Using earthquake data like a planetary CT scan and computer models, researchers reconstructed the gravity hole’s history and plan to explore how these interior processes influence climate.

via ScienceDaily|

#antarctica #earth-and-climate #earthquakes

science1 month ago•2 min saved

Space-Born Jellyfish Hint at Gravity Challenges for Future Humans

NASA tested gravity sensing in space by sending thousands of jellyfish polyps to orbit in the 1990s. After about nine days, tens of thousands of jellyfish developed, but once returned to Earth the space-born jellyfish struggled to swim and exhibited vertigo, suggesting that humans born in space might also face difficulties re-adapting to Earth's gravity.

via BBC Wildlife Magazine|

#gravity #jellyfish #microgravity

science1 month ago•5 min saved

Antarctic Gravity Dip Unmasks 70 Million Years of Deep-Earth Dynamics

Researchers reconstructed the Antarctic geoid low over ~70 million years, showing a persistent gravity valley shaped by deep mantle flow and evolving upper-mantle buoyancy. A major change in amplitude and position occurred between 50 and 30 million years ago, linked to long‑term subduction and upwelling, with a possible connection to true polar wander and Antarctica’s ice-sheet history. The study cautions that while deep-Earth dynamics can reshape the gravity field, translating this into climate or ice-sheet impacts requires further work.

via Indian Defence Review|

#antarctica #geoid #gravity

science1 month ago•36 min saved

Deep-Earth Phase Shift Behind Mysterious Gravity Glitches

NASA/DLR GRACE data showed a deep mantle gravity anomaly from 2006–2008 stretching across the eastern Atlantic. Scientists traced the signal to a phase transition in bridgmanite near the core–mantle boundary, where mineral structure changes redistribute mass and alter density. This deep-seated gravitational anomaly, not fully explained by surface water, helps explain previous geomagnetic-field–related gravity fluctuations and will guide models of core–mantle dynamics and mantle convection.

via Yahoo|

#bridgmanite #core-mantle-boundary #grace

science1 month ago•56 min saved

Antarctica’s Subtle Gravity Dip Unveils a 70-Million-Year Deep-Earth Tale

A new study using seismic data and mantle-flow modeling shows Antarctica hides a large, persistent gravity low called the Antarctic Geoid Low. Reconstructing roughly 70 million years of mantle motion, researchers find this gravity feature is not a transient anomaly but a long-lived imprint of deep-Earth dynamics that intensified around 34 million years ago as Antarctica became permanently ice-covered. While it’s not a literal hole, the gravity dip reveals how mass is distributed deep inside Earth and could subtly influence regional sea levels, underscoring how slow, deep-earth processes reshape the planet’s gravity field over geological time.

via Space|

#antarctic-geoid-low #deep-earth #gravity

science1 month ago•56 min saved

Gravity on the gut: a new theory linking IBS to gravity tolerance

A Cedars-Sinai doctor advances a novel “gravity intolerance” theory suggesting IBS risk may hinge on how the body tolerates gravity. Using a framework called the G-force cube (resistance, detection, vigilance), he argues gravity-related factors could unify IBS with related conditions like anxiety, pain sensitivity (fibromyalgia), and POTS. The idea is preliminary and not a replacement for established IBS factors (bacteria, inflammation, diet, genetics); more research is needed, but gravity may help organize known risk factors and guide future study.

via Space|

#gastroenterology #gravity #gut-brain-axis

space2 months ago•80 min saved

Infrared-running gravity hints a gravity-based path to galaxy rotation without dark matter

A Space.com article reports a new theory by Naman Kumar proposing infrared-running gravity, a scale-dependent modification of gravity that could explain galaxy rotation curves without invoking dark matter while remaining compatible with early-universe constraints; however, the approach is not yet a full replacement for dark matter in cosmology, and further work is needed to compare its predictions with gravitational lensing and galaxy-cluster observations.

via Space|

#dark-matter #galaxy-rotation #gravitational-lensing

science2 months ago•4 min saved

Gravity Emerges from Quantum Entropy: A Bold Entropic View of the Universe

A new theory proposes gravity is not fundamental but emerges from entropy, specifically quantum relative entropy, with spacetime acting as a quantum operator and a G-field linking matter and geometry. The approach aims to reconcile general relativity and quantum mechanics, potentially offering a fresh view on dark matter and the cosmological constant, though the idea remains unproven.

via The Daily Galaxy|

#dark-matter #entropic-gravity #gravity

science2 months ago•37 min saved

Entropy Could Be Gravity’s Hidden Origin, Pointing Toward Quantum Gravity

A new theory by physicist Ginestra Bianconi suggests gravity may emerge from entropy, potentially reconciling Einstein’s general relativity with quantum theory. By treating spacetime as a quantum operator and describing an entropic action that couples matter to geometry through a G-field, the framework aims to yield a small cosmological constant and offer a candidate explanation for dark matter. While intriguing, the idea remains speculative and requires substantial further work to confirm its viability as a unified theory of physics.

via Yahoo News Canada|

#dark-matter #entropy #gravity

science2 months ago•11 min saved

Graviton trap aims to witness gravity's quantum particle

Scientists at Stevens Institute of Technology and Yale University are launching the world’s first experiment to detect gravitons, using a centimeter-scale resonator filled with superfluid helium cooled to its quantum ground state. A passing gravitational wave should impart energy that becomes a single graviton, converted into a phonon and read out with precision lasers. By scaling the detector from gram-scale to larger detectors, the team hopes to observe gravitons directly and bridge General Relativity with Quantum Mechanics, backed by the Keck Foundation.

via Interesting Engineering|

#graviton #gravity #quantum-mechanics

entertainment2 months ago•9 min saved

No Gravity Collapse: Debunking the Viral 'Gravity Ends' Claim

Lifehacker debunks a viral claim that gravity will stop for seven seconds on August 12, 2026, noting there’s no secret NASA document or project called 'Anchor.' Cosmologist Joel Meyers explains you’d mostly float rather than slam into ceilings, gravity isn’t what binds our bodies, and the planet wouldn’t instantly explode; atmospheric and tectonic effects would be complex and unpredictable. The article also explains why the rumor spread, what would realistically happen, and even a tongue-in-cheek survival plan, ultimately concluding the event is extremely unlikely.

via Lifehacker|

#conspiracy-theories #debunking #entertainment