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- Science > Physics > Gravity
- Science > Physics > Gravity > Gravitational Waves
- Science > Physics > Quantum Mechanics > Quantum Gravity
- Science > Ecology > Energy Storage > Gravity Power
- Gravity Shielding Experiments (Fusion Information Center - Dart)
"Although Podkletnov has said that tests ruled out the possibility that the claimed weight loss was the result of magnetic fields or air flow, his statement is suspect." Provides an alternative explanation to the "anti-gravity" effect that Podkletnov claimed for his experiments. 8-02
- Gravity Shielding Experiments (Interprise Mission - Matthews and sample)
"Scientists in Finland are about to reveal details of the world's first anti-gravity device. Measuring about 12 inch across, the device is said to reduce significantly the weight of anything suspended over it."
"The claim -- which has been rigorously examined by scientists, and is due to appear in a physics journal next month -- could spark a technological revolution. By combatting gravity, the most ubiquitous force in the universe, everything from transport to power generation could be transformed." Includes a diagram. 8-02
- Gravity Shielding Experiments - Applications (Brown)
Discusses uses of a possible "anti-gravity" device, based on the work of Eugene Podkletnov. Includes a diagram. 8-02
- Scientists Begin Quest to Detect Gravity Waves (SpaceDaily.com)
"Armed with one of the most advanced scientific instruments of all time, physicists are now watching the universe intently for the first evidence of gravitational waves." 6-03
- Speed of Gravity Not Yet Proven (SpaceDaily.com)
"Albert Einstein may have been right that gravity travels at the same speed as light but, contrary to a claim made earlier this year, the theory has not yet been proven." 6-03
- Gravity - Keys That Do Not Fall to the Floor (Education World - Cobb)
Provides an experiment for children and teens to perform. 12-04
- Loop Quantum Gravity (Wikipedia.org)
"Loop quantum gravity (LQG) is a proposed theory of spacetime which is built from the ground up with the idea of spacetime quantization via the mathematically rigorous theory of loop quantization. It preserves many of the important features of general relativity, such as local Lorentz invariance, while at the same time employing quantization of both space and time at the Planck scale in the tradition of quantum mechanics."
"This is not the most popular theory of quantum gravity; many physicists have philosophical problems with it. For one thing, the critics of this theory say that LQG is one theory of gravity and nothing more. There are many other theories of quantum gravity, and a list of them can be found on the Quantum gravity page." 01-06
- Quantum Gravity (Stanford Encyclopedia of Philosophy)
"Quantum Gravity: A physical theory describing the gravitational interactions of matter and energy in which matter and energy are described by quantum theory. In most, but not all, theories of quantum gravity, gravity is also quantized. Since the contemporary theory of gravity, general relativity, describes gravitation as the curvature of spacetime by matter and energy, a quantization of gravity implies some sort of quantization of spacetime itself. Insofar as all extant physical theories rely on a classical spacetime background, this presents profound methodological and ontological challenges for the philosopher and the physicist." 01-06
- Quantum Gravity (Cambridge University)
Provides various models for handling quantum gravity. 01-06
- Quantum Gravity (Wikipedia.org)
"Quantum gravity is the field of theoretical physics attempting to unify the theory of quantum mechanics, which describes three of the fundamental forces of nature, with general relativity, the theory of the fourth fundamental force: gravity. The ultimate goal of some is a unified framework for all fundamental forces—a theory of everything." 01-06
- Quantum Gravity
- Gravity Power With Pumped Hydro Energy Storage (TriplePundit.com)
"The only method of energy storage with any significant deployment is pumped hydro, with more than 120,000 megawatts installed globally. But the last large scale pumped hydro project went online more than thirty years ago, and almost all of that capacity is used as “peaking” power for baseload sources like coal, oil, and nuclear power."
"Other technologies, such as batteries, thermal energy, or compressed air storage are considered candidates for renewable energy storage. But these solutions can be costly, difficult to scale to grid-sized operations, and are fraught with environmental concerns. And so it is with conventional pumped hydro." 06-12
- Quantum Field Theory and Quantum Gravity (SimonFoundation.org)
"The revelation that particle interactions, the most basic events in nature, may be consequences of geometry significantly advances a decades-long effort to reformulate quantum field theory, the body of laws describing elementary particles and their interactions. Interactions that were previously calculated with mathematical formulas thousands of terms long can now be described by computing the volume of the corresponding jewel-like “amplituhedron,” which yields an equivalent one-term expression."
"The new geometric version of quantum field theory could also facilitate the search for a theory of quantum gravity that would seamlessly connect the large- and small-scale pictures of the universe. Attempts thus far to incorporate gravity into the laws of physics at the quantum scale have run up against nonsensical infinities and deep paradoxes. The amplituhedron, or a similar geometric object, could help by removing two deeply rooted principles of physics: locality and unitarity." 09-13
- Scientists May Have Detected Gravity Waves (NewScientist.com)
"Gravitational waves are ripples in space-time predicted by Einstein’s theory of general relativity. It tells us that massive objects like black holes and neutron stars warp space-time around themselves, and when two such behemoths collide, the distortions ripple outward at the speed of light. Although we are pretty confident this happens, the waves themselves have never been directly measured."
"That may be about to change."
"The LIGO detectors, located 3000 kilometres apart in Hanford, Washington and Livingston, Louisiana, can pick up passing gravitational waves by measuring how space-time stretches and contracts – by as little as one ten-thousandth the diameter of a proton."
"Models show that the signal from the merger of two neutron stars or black holes resembles a chirp, its frequency rising until a final crash. Studying the signal gives an idea of how far away the event happened and the masses of the two bodies."
"If we had a third detector, we could triangulate the source of the signal. That will be possible later this year, when the VIRGO experiment in Cascina, Italy, comes online. But with only the twin detectors, the best we can do is gesture vaguely toward a region of the sky." 02-16
- Scientists Have Detected Gravity Waves (New York Times)
"A team of physicists who can now count themselves as astronomers announced on Thursday that they had heard and recorded the sound of two black holes colliding a billion light-years away, a fleeting chirp that fulfilled the last prophecy of Einstein’s general theory of relativity."
"That faint rising tone, physicists say, is the first direct evidence of gravitational waves, the ripples in the fabric of space-time that Einstein predicted a century ago (Listen to it here.). And it is a ringing (pun intended) confirmation of the nature of black holes, the bottomless gravitational pits from which not even light can escape, which were the most foreboding (and unwelcome) part of his theory."
"More generally, it means that scientists have finally tapped into the deepest register of physical reality, where the weirdest and wildest implications of Einstein’s universe become manifest."
Editor's note: Some of this description, such as the power emitted, may be incorrect." 02-16
- Trailers for Bikes (Cycletote.com)
The "bare trailer" model starts at around 265 dollars, weighs 16.5 pounds, and has a very low center of gravity. Based on specifications and review, this is a Best Buy. Has an automatic disk brake option (for 265 dollars), which is desirable with any trailer when going down steep hills or during emergency stops. It has two wheels and is made of steel for durability. Awesome Library does not endorse this product, but only provides it as an example. 8-01
- Gravitons May Link Subatomic Particles and Beginning of Time (UniSci.com - Hogan and Stricherz)
"Unlike subatomic particles that make up matter and energy as we know them, gravitons are elementary particles that compose the fabric of space and time."
" 'No one has ever seen a graviton, but with these new efforts we might,' Hogan said. 'If you can see gravitons in these maps, then you'll start to see the essence of space and time and matter.' " 3-02
- Black Hole Pulls a Star in Orbit of Galaxy (USA Today - Vergano)
"Astronomers using the Hubble Space Telescope have captured evidence of a black hole hurtling through our Milky Way galaxy with gravity so strong it's dragging a star with it." 11-02
- 12-26-03 Beagle 2 Silent, But Orbiter Successful (CNN News)
"Even though a Mars probe has failed to signal it has landed, scientists at the European Space Agency said on Friday the primary mission goal to put a satellite in orbit around Mars was achieved."
"After a six-month, 100 million-km (63 million-mile) journey from Earth to look for signs of life on the planet, the Mars Express will circle the planet on an orbit between 250 km and 12,000 km."
"It will study the surface of the planet, its geology, its weather, and also analyse the atmosphere and its gravity." 12-03