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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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+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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+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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+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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+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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+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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+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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