Articles tagged with Gravitation
Physicists Eric Linder and Robert Caldwell separate dark energy scenarios through satellite searches, offering a way to distinguish among dark energy possibilities. The Joint Dark Energy Mission experiments may be able to determine which scenario is correct.
Researchers improve measurement of Casimir force, influencing small objects more than gravity, with implications for nanotechnologists. The study confirms gravity behaves as expected, ruling out exceptions to Newton's theories.
Scientists at PNNL develop MicroCATS, a system to produce propellant from Martian resources, regenerating breathable air and enabling life support. The goal is to advance microtechnology principles for larger-scale Mars missions by 2030.
According to Professor Andrew Hamilton, the core of a black hole is not a singular point of infinite density but rather a hot, dense plasma that siphons matter into itself. This plasma could be the cause of a space traveller's demise in larger black holes.
Researchers have developed a new positive air pressure chamber that enables early upright gait rehabilitation after lower-extremity orthopaedic surgery. The device allows for precise adjustment of air pressure to minimize impact on the patient's joints and facilitate faster healing.
A team of researchers has identified 219 chemicals that affect plant growth due to gravity, leading to a better understanding of protein transportation and genetic signaling in plant cellular membranes. The discovery uses chemical genomics to study the link between endomembrane system components and gravitropic response.
Researchers investigated how reduced gravity affects bacteria, finding that certain species may thrive in space station environments. The study suggests that microgravity, combined with radiation resistance and low nutrient conditions, contributes to the success of water system bacteria.
Researchers found that rotating black holes can cause negative refraction in electromagnetic radiation, affecting our knowledge of the universe. This discovery highlights the importance of considering gravitational forces when studying the origin of the universe.
Dvali suggests extra dimensions allow gravitons to escape, altering space-time continuum and accelerating cosmic expansion. This theory predicts observable deviations at shorter distances than predicted by modified gravity hypothesis.
Experiments on moss grown in space showed it formed striking clockwise spirals despite the absence of gravity. Common roof moss grew in a residual spacing mechanism intended to control colony growth and branch distribution.
Astronomers have detected Regulus' rotationally induced distortions using the CHARA array, revealing its temperature difference between polar and equatorial regions. The star's centrifugal force causes it to expand, resulting in gravity darkening, where it becomes brighter at its poles than at its equator.
The SDSS team detected ripples in the galaxy distribution made by sound waves, providing evidence that galaxies grew via gravity. The findings support the standard cosmological model and provide insights into dark matter and dark energy's properties.
A new method enables engineers to design more efficient heating, cooling, and other systems for spacecraft in space, on the moon, and Mars. The system uses a two-phase fluid behavior that can transfer heat effectively, making it compact and lightweight.
Facial aging is attributed to the loss of facial fat and skin changes, rather than gravitational forces. Plastic surgeons must balance tightening tissue with replacing lost facial fat using wrinkle fillers.
Researchers estimate that a neutron star is about 1.8 times as massive as the sun with a radius of about 7 miles, sparking interest in its equation of state and superfluid properties. The findings rule out free quarks and provide insights into the density-pressure relationship within the star.
Scientists are conducting an experiment to gather information about the deep underlying structures of the San Andreas fault line using a highly sensitive gravity instrument. The goal is to affordably gather data and compare future surveys to track changes in the shallow crust beneath the surface.
Researchers use physics and transportation theory to define a network of spatial spread of contagious disease. The models accurately predicted the spread of childhood diseases like measles and animal diseases like phocine distemper.
Theoretical physicists propose a new test to verify string theory, which could provide support within two years. The test involves detecting the gravitational signature of leftover cosmic strings from the universe's creation.
Astronomers have detected a lensed quasar more than twice as wide as any previously reported, offering insights into dark matter and its distribution. The discovery provides evidence for the presence of massive galaxy clusters, which can be used to study dark matter.
Astronomers have found evidence of rapid galaxy formation in the early universe, including ultra-massive black holes and mature galaxies that formed at an unprecedented rate. This discovery poses a significant challenge to the cold dark matter theory, which predicts galaxies formed through a bottom-up process.
Ripple features on Mars have been found to be almost 20 feet high, much taller than those on Earth, with the exact heights and grain sizes still unknown. The dimensions of these Martian ripples are likely influenced by lower gravity and may reveal insights into local and regional weather patterns.
Gravitational waves are ripples in space-time produced by massive objects' acceleration. The detection of these waves will provide unique information about astrophysical systems like supernovae and black hole formation.
Physicists at the University of California, Irvine have discovered superweakly interacting massive particles (superWIMPs) that may constitute up to one-quarter of the universe's mass. These new particles are predicted to be stable and could provide an alternative explanation for dark matter.
A scientist at Berkeley Lab has re-examined the 2002 experiment claiming to measure the speed of gravity and found that it was based on a flawed assumption. The correct formula yields effects significantly smaller than initially thought, making measurement with current technology impractical.
String theory predicts the existence of moduli forces with strengths comparable to gravity, which could be detected on length scales of one-tenth of a millimeter. Researchers used an experiment to search for these forces and found that they are unlikely to exist at distances smaller than previously thought.
Fotini Markopoulo Kalamara presents a fresh approach to researching theoretical possibilities for looking inside black holes and at particles of space/time. She proposes that an 'inside' quantum theory of gravity should be the collection of all partial observations of the inside observers.
A team of scientists has discovered that chaotic wave patterns in the heart's electrical pulses can be controlled and potentially terminated using a weak periodic modulation. This discovery could lead to new methods for treating cardiac fibrillation, a life-threatening condition.
Researchers investigate how simple plants like moss grow when deprived of gravity, exploring the role of light and internal forces. The study aims to understand the cellular mechanisms guiding plant growth and development in space.
Researchers at Purdue University are conducting an experiment to measure the Casimir effect, which could reveal new forces beyond the three spatial dimensions of length, width, and height. The study uses plates made of isotopes of nickel to test for a potential 'fifth force' that could interact with extra dimensions.
A team of astronomers has discovered a planet-shaped 'wake' around the nearby star Fomalhaut, suggesting the presence of an orbiting giant planet. The observation was made using the SCUBA camera, which operates in the submillimetre region of the electromagnetic spectrum.
Cosmologists suggest universe may collapse in 10-20 billion years due to dark energy, reversing the popular view of a runaway universe. The Stanford team's model predicts the universe will slow down and contract, leading to a cosmic 'big crunch',
Scientists have discovered a significant upward bulge at the equator and downward bulge at the poles in the Earth's gravity field. The observed changes are counteracting the gravitational effects of post-glacial rebound, leading researchers to investigate potential causes such as climate change or ocean circulation.
Researchers have developed a computer model to visualize gravitational waves produced by black-hole mergers, providing insight into Einstein's theory of general relativity. The model predicts that the waves will be relatively weak until moments before the merger, culminating in a thunderous impact.
A team of scientists led by Indiana University's Alan Kostelecky aims to determine if Albert Einstein's theory of relativity holds true. By comparing extremely precise clocks in zero gravity, they may find changes that contradict the theory, revolutionizing our understanding of space and time.
A Stanford scientist is conducting a groundbreaking study to determine the long-term effects of hypergravity on humans. Participants will spend nine weeks in a NASA centrifuge rotating at increasingly faster speeds, simulating conditions found during space shuttle takeoff and landing.
A team of scientists developed a numerical model to simulate vulcanian eruptions, using field data and computer simulations to understand the internal processes. The model revealed that water vapor leakage affects explosion energy and pinpointed the source of pyroclastic flows.
Physicist Maria Spiropulu proposes a new reality theory that unifies gravity and electromagnetism. Researchers are using high-energy particle collisions to detect the signature of extra dimensions, which may reveal a mysterious sister world with compacted or finite dimensions.
A team led by Tom Murphy will use laser ranging and a large telescope to measure the moon's distance from Earth with accuracy of a millimeter. The project will also test Einstein's equivalence principle and the strength of gravitational interaction, providing insights into gravity's nature.
Researchers at Penn State have developed a new model for vulcanian eruptions, which they validated using data from the Soufriere Hills volcano. The model suggests that water vapor leakage plays a crucial role in determining the rate and force of these explosive events.
Astronomers have shed new light on dark matter distribution by tracing it closely to galaxy patterns. They found that dark matter is distributed in a parallel pattern to galaxies and makes up about seven times more mass than ordinary matter.
A team of scientists discovered a small, faint galaxy at 13.4 billion light-years using the Hubble Space Telescope and Keck Telescopes. The galaxy, with a mass of just a few million times that of our Sun, is thought to be one of the earliest building blocks of galaxies.
The center supports an interdisciplinary team of scientists aiming to explore the first signals detected from gravitational waves generated by massive objects in the universe. Researchers anticipate collecting data from new detectors in the US, Europe, and Japan, plus a space-based detector.
The Lazarus Team has made predictions for the gravitational waves emitted during black hole mergers, allowing for the first-ever detections. These simulations will provide astronomers with a set of templates to recognize signals in noise from detectors and deduce the masses and distances of the holes.
The discovery confirms the existence of an event horizon around the massive black hole Cygnus XR-1. The data shows chaotic fluctuations in ultraviolet light from swirling gas, consistent with theories of what scientists predict to see when matter falls close to the event horizon.
Astronomers have captured the clearest view of a galaxy pipeline, where material flows between two compact galaxies after a collision. The pipeline, stretching 20,000 light-years, is believed to contribute to a lack of star birth in NGC 1409, as gas flows in is too hot to form stars.
The Stardust spacecraft is set to receive a gravity boost from Earth, lengthening its orbit and setting it on course for a rendezvous with comet Wild 2. The spacecraft will capture particles being boiled off the comet's surface by solar heating.
Astronomers use a flickering quasar image to estimate the expansion rate of the Universe and measure distances to extragalactic objects. The Chandra X-ray Observatory's mirage technique provides a promising method to avoid uncertainties in classic distance-ladder techniques.
Researchers at Case Western Reserve University have developed a technique to simulate various gravitational environments using a magnetic levitation method. This allows them to study the behavior of liquids and solids in conditions ranging from Earth's gravity to zero-G environments, providing new insights into fluid dynamics.
Researchers found that a specific orbital alignment in 2014 provides an ideal escape route back to Earth in case of an emergency on the way to Mars. This trajectory is only possible within a few days of January 14, 2014, making it a critical launch window for future human missions.
Researchers Jens Gundlach and Stephen Merkowitz present the most precise measurement of Isaac Newton's gravitational constant, reducing uncertainty by nearly a factor of 100. Their calculations yield an Earth mass of approximately 5.972 sextillion metric tons.
Researchers at Johns Hopkins University used electric fields to detach and move bubbles in microgravity, overcoming a major challenge for space cooling systems. The experiment, conducted on a NASA jet, provided valuable insights into the unusual behavior of bubbles in zero gravity.
Researchers from Max Planck Institute simulated grazing collisions of two black holes, finding huge amounts of energy coalescing black holes emit in gravitational waves. The simulations revealed that these events could release one percent of the combined mass's energy, a phenomenon thousand times more powerful than our sun's emissions.
The new gradiometer has the potential to revolutionize submarine navigation and underground structure detection, offering improved accuracy and reduced costs. Its commercial applications include geophysical mineral exploration and archaeological studies, enhancing our understanding of hidden pathways and structures.
NASA is investing half a million dollars in an experiment to create a device that shields a rocket from the Earth's gravity. The project, led by physicist Ronald Koczor, aims to replicate elements of Russian scientist E. E. Podkletnov's controversial experiments on antigravity.
Researchers found supernovas are fainter than expected, suggesting the universe has expanded more slowly in the past and is now accelerating. This discovery supports the Cosmological Constant theory, which had been dismissed by Albert Einstein, and has significant implications for our understanding of the universe's behavior.
A new study confirms that magma is forcing Long Valley Caldera to rise, which could lead to a volcanic eruption in the future. The researchers used precise gravity measurements to distinguish between magma and water, finding a systematic increase in mass beneath the resurgent dome.
NASA scientists have discovered an anomaly in Pioneer 10's trajectory, suggesting the spacecraft may be experiencing an unexplained force pulling it towards the Sun. The effect has been observed in multiple Pioneer and Ulysses probes, challenging current theories of gravity.
A team of researchers led by Stephen M. Highstein will study the response of saltwater fish to near-zero gravity conditions on a space shuttle mission. By analyzing signals from the fish's brains, they hope to reveal clues about why astronauts suffer from motion sickness in space.
Hot, ionized gas streams toward the galactic center, bending sharply around it and slingshoting out the other side due to its high velocity. The findings may provide clues to the nature of the mysterious black hole candidate.
Researchers use numerical simulations to show connection between Earth's changing shape and gravitational effects of other bodies in the Solar System. The study reveals that changes in the Earth's axial tilt can produce large changes in climate.