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What is Time, According to Physics?

on March 29, 2019

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Time is far more than just a human invention.

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This is Why Physicists Think String Theory Might be our “Theory of Everything”

It’s one of the most brilliant, controversial and unproven ideas in all of physics: string theory. At the heart of string theory is the thread of an idea that’s run through physics for centuries that at some fundamental level, all the different forces, particles, interactions and manifestations of reality are tied together as part of the same framework. Instead of four independent fundamental forces — strong, electromagnetic, weak and gravitational — there’s one unified theory that encompasses all of them. In many regards, string theory is the best contender for a quantum theory of gravitation, which just happens to unify at the highest-energy scales. Even though there’s no experimental evidence for it, there are compelling theoretical reasons to think it might be true. Back in 2015, the top living string theorist, Ed Witten, wrote a piece on what every physicist should know about string theory. Here’s what that means, even if you’re not a physicist. When it comes to the laws o

China Just Set A New Nuclear Fusion Record By Reaching Temperatures Of 100 Million Degrees

China says it has performed a key test of a nuclear fusion machine it is developing, reaching temperatures about seven times that of the Sun’s interior. The test took place at the Experimental Advanced Superconducting Tokamak (EAST) at the Hefei Institutes of Physical Science of the Chinese Academy of Sciences (CASHIPS). The machine reached temperatures of more than 100 million °C (180 million °F), the temperature at which nuclear fusion takes place. EAST is a tokamak reactor, which is shaped like a donut and uses large currents to twist the plasma inside, confining it using magnetic fields. Another type of reactor, called a stellerator, is shaped like a twisted donut to twist the magnetic fields. In the past few years, a number of experimental fusion reactors have successfully sustained a plasma for a minute or so. China’s test is particularly significant though for the temperatures it achieved. The interior of our Sun reaches temperatures of “just” 15 million °C (27 mi

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What is Time, According to Physics?

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