All articles tagged with #gravity
Originally Published 2 months ago — by Space
Scientists have confirmed that dark matter obeys gravity on large scales, which constrains the possibility of a fifth fundamental force in the universe, though it cannot be completely ruled out if it is weaker than 7% of gravity. This discovery helps refine our understanding of dark matter's behavior and limits the strength of any unknown forces acting upon it.
Originally Published 2 months ago — by Yahoo
Black holes are formed from collapsing massive stars, creating a region with an event horizon beyond which nothing can escape, and possibly a singularity where matter is compressed infinitely. They influence their surroundings through accretion disks and jets, distort time and space, and may eventually evaporate via Hawking radiation, playing a crucial role in understanding the universe's fundamental laws.
Originally Published 2 months ago — by Nature
Physicists are debating whether gravity can produce quantum entanglement, with recent proposals suggesting that gravity might have quantum effects without being a quantum theory itself, challenging traditional views and opening new avenues for understanding the fundamental nature of gravity and quantum mechanics.
Originally Published 2 months ago — by Nature
Classical theories of gravity, when combined with quantum field theory, can generate entanglement through virtual matter propagators, challenging the notion that entanglement necessarily indicates quantum gravity. Experiments inspired by Feynman's thought experiment suggest that observing entanglement alone cannot definitively prove gravity's quantum nature, as classical gravity can also produce entanglement under certain conditions.
Originally Published 3 months ago — by ScienceAlert
A new study using the GRAVITY+ instrument on the VLT has revised the mass of the brightest known quasar, J0529, from 10 billion to 800 million solar masses by accounting for gas outflows that skewed previous measurements, providing new insights into black hole growth and galaxy formation in the early universe.
Originally Published 3 months ago — by Avi Loeb – Medium
The article discusses the gravitational properties of the interstellar object 3I/ATLAS, estimating its size, rotation, and escape velocity, and comparing its gravity to familiar objects like the Moon and Earth, highlighting its relatively weak gravity despite its large mass, and exploring its physical characteristics and public interest.
Originally Published 3 months ago — by Business Insider
Poor posture can contribute to bloating and digestive issues by compressing internal organs; improving posture through exercises like dead hangs and using accessories such as weighted vests can help alleviate symptoms, emphasizing the importance of standing straight for better gut health.
Originally Published 3 months ago — by The Conversation
The article explains why we can't feel Earth's movement despite its high speeds, highlighting that Earth's steady, smooth motion and gravity keep us grounded, and that we observe Earth's movement through astronomical clues like day/night cycles and changing star positions.
Originally Published 4 months ago — by Big Think
The article explores the historical and scientific development of the concept of black holes, starting with John Michell's 18th-century theoretical prediction of 'dark stars' with gravity so strong that light couldn't escape, leading up to modern discoveries of supermassive black holes at galaxy centers, confirmed by recent Nobel Prize-winning research.
Originally Published 4 months ago — by Nature
The article discusses the challenge of unifying gravity with quantum theory, highlighting the differences between how quantum mechanics and general relativity conceptualize space and time. It explains the limitations of the Copenhagen interpretation for quantum gravity and explores Richard Feynman's alternative approach, which focuses on events and histories in space-time rather than dualities of location, as a promising way forward in understanding quantum gravity.
Originally Published 4 months ago — by yahoo.com
A recent study suggests that the behavior of wide binary stars at very low accelerations cannot be fully explained by traditional Newton-Einstein gravity, potentially supporting Modified Newtonian Dynamics (MOND) as an alternative explanation, challenging current understanding of gravity and dark matter.
Originally Published 5 months ago — by The Debrief
Researchers are making significant advances in quantum physics with the aim of reconciling it with gravity, a longstanding challenge in physics. New experiments and theories, including testing quantum entanglement via gravity and observing space-time wobble, are promising steps toward understanding whether gravity is quantum in nature. Although many experiments are still in development, the field is entering a new era of potential breakthroughs.
Originally Published 5 months ago — by WION
Black holes form from collapsing massive stars and have a strong gravitational pull, but their influence is limited to nearby objects. They do not actively suck in matter from afar, and the universe's expansion and black hole evaporation prevent them from consuming the entire universe. Therefore, black holes are not a threat to the universe as a whole.
Originally Published 5 months ago — by SciTechDaily
A team of scientists proposes a new, minimalist theory of the Universe's origins that relies solely on gravity and quantum mechanics, avoiding speculative fields and adjustable parameters, and suggests that gravitational waves could have seeded cosmic structure, potentially reshaping our understanding of the Big Bang.
Originally Published 6 months ago — by The Dodo - For Animal People
Dan, a dog in Virginia, experiences a moment of realization about gravity after observing an apple fall from a tree, reminiscent of Isaac Newton's famous discovery, and has been testing the theory since then.