Has Twin Paradox been proven?
According to Einstein’s theory of relativity, the traveling twin should return younger than his brother—strange but true. NASA’s study won’t test the flow of time. The ISS would have to approach the speed of light for relativistic effects to kick in. Just about everything else is covered, though.
Why is Earth not an inertial frame of reference?
Strictly speaking, Newton’s laws of motion are valid only in a coordinate system at rest with respect to the “fixed” stars. A coordinate system attached to the Earth is not an inertial reference frame because the Earth rotates and is accelerated with respect to the Sun.
Which of the following is correct Lorentz transformation?
In physics, the Lorentz transformations are a six-parameter family of linear transformations from a coordinate frame in spacetime to another frame that moves at a constant velocity relative to the former.
Where does the Lorentz factor come from?
The expression appears in several equations in special relativity, and it arises in derivations of the Lorentz transformations. The name originates from its earlier appearance in Lorentzian electrodynamics – named after the Dutch physicist Hendrik Lorentz. It is generally denoted γ (the Greek lowercase letter gamma).
Why speed of light does not depend on frame of reference?
According to Special Relativity, as a frame goes faster, it shortens more in the direction of motion, relative to the stationary observer. In the limit that it travels at exactly the speed of light, it contracts down to zero length. In other words, there is no valid reference frame at exactly the speed of light.
What is proper time in relativity?
In relativity, proper time along a timelike world line is defined as the time as measured by a clock following that line. This interval is the quantity of interest, since proper time itself is fixed only up to an arbitrary additive constant, namely the setting of the clock at some event along the world line.