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+14 +1
Why No One Has Measured The Speed Of Light
Physics students learn the speed of light, c, is the same for all inertial observers but no one has ever actually measured it in one direction.
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+19 +1
Scientists take an atomic clock on the road and use it to measure the height of a mountain
Most of us think of time as a way to measure things like the length of our days and the span of our lives. But if you had access to a pair of extremely high-precision clocks, you could use time in a different way — to measure the height of mountains. This week, scientists described a major step forward in using time to determine height above sea level. For the first time, they took an optical atomic clock out of the lab. Their liberated device was brought into the French Alps.
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+12 +1
How Fuzzballs Solve the Black Hole Firewall Paradox
By replacing black holes with fuzzballs — dense, star-like objects from string theory — researchers think they can avoid some knotty paradoxes at the edge of physics. By Jennifer Ouellette.
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+13 +1
The cosmic dance of three dead stars could break relativity
Do we have the first hints that Einstein is about to be proven wrong? A stellar system discovered in 2012 looks like the ideal experiment to tell us. By Joshua Sokol.
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+9 +1
Scientists have done what Einstein said was impossible — used relativity to measure a star's mass
A little more than 100 years after Einstein developed his theory of general relativity, researchers have used its laws to measure the mass of a white dwarf star. By Amina Khan.
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+17 +1
Time travel is mathematically possible, but don’t expect it anytime soon
The proposed method relies on the invention of a material known as ‘exotic matter.’ By Abigail Beall.
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+41 +1
Violations of energy conservation in the early universe may explain dark energy
Physicists have proposed that violations of energy conservation in the early universe, as predicted by certain modified theories of quantum mechanics and quantum gravity, may explain the cosmological constant problem, which is sometimes referred to as “the worst theoretical prediction in the history of physics.” By Lisa Zyga.
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+25 +1
Physicists Theorize Wormhole Travel Is Possible
In a paper published in a physics journal, Dr. Diego Rubiera-Garcia and his team posited that a spacecraft could survive wormhole travel. By MJ Banias.
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+6 +1
LIGO Black Hole Echoes Hint at General Relativity Breakdown
Gravitational wave data show tentative signs of firewalls or other exotic physics By Zeeya Merali.
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+6 +1
Why must time be a dimension?
Sure, we move through it just like space, but it was the aftermath of Einstein that led to us truly understanding it. By Ethan Siegel.
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+8 +1
When Einstein Tilted at Windmills
The young physicist’s quest to prove the theories of Ernst Mach. By Amanda Gefter.
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+12 +1
How an Award-Winning Economist’s Weird Discovery May Challenge General Relativity
In 2004, The Economist reported on a study by Chris Duif with the Delft University of Technology in the Netherlands, who was convinced after further research of his own that the phenomenon known as the Allais effect is not only real, but that it could still qualify as being unexplained… By Micah Hanks.
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+18 +1
Remarkable New Theory Says There’s No Gravity, No Dark Matter, and Einstein Was Wrong
A theoretical physicist proposes a new way to think about gravity and dark matter. By Paul Ratner,
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+22 +1
What Sonic Black Holes Say About Real Ones
Can a fluid analogue of a black hole point physicists toward the theory of quantum gravity, or is it a red herring? By Natalie Wolchover.
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+20 +1
Tangled Up in Spacetime
Hundreds of researchers in a collaborative project called “It from Qubit” say space and time may spring up from the quantum entanglement of tiny bits of information. By Clara Moskowitz.
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+18 +1
The Hidden Science of the Missing Gravitational Waves
A relatively unknown experiment is already drawing conclusions from the sound of silence. By Sarah Scoles.
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+18 +1
Hold Up, Did We Just Crack Time Travel?
Astrophysicists famously proved Einstein’s theory on the existence of gravitational waves last week. Here’s the less covered part of it all: It might, down the line, bring us closer to moving through time. By Michael Howard.
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+20 +1
The Death of General Relativity Lurks in a Black Hole’s Shadow
Scientists are compiling a picture of the shadow of the supermassive black hole at the center of the Milky Way, and it could reveal general relatively breaking down. By Lizzie Wade.
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+30 +1
It’s about time: how sci-fi has described Einstein’s universe
A century after the publication of the general theory of relativity, sci-fi is still grappling with its implications, and still trying to explain it to the rest of us. By Damien Walter.
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+16 +1
A Radical Reinterpretation of Einstein’s Theory
A cadre of physicists working on the theory of shape dynamics could change our understanding of reality. By Dan Falk.
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