High School Can a Planet Made of Glass Generate Free Energy?

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The discussion centers on the concept of whether a planet made of glass with mirror walls could generate free energy through light blueshifting in a gravitational field. It is noted that while light can blueshift when moving down a gravitational well, it experiences a corresponding redshift on the return journey, resulting in no net energy gain. The initial premise of vacuum antigravitating and generating energy is deemed incorrect. Consequently, the inquiry into the potential for free energy from such a system is considered flawed. The thread concludes that the premise does not hold, leading to its closure.
Pony
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As far as I know, if vacuum antigravitates, it makes the light that travels through it redshift, e.g. in a very large empty box with mirror walls, light will just lose energy.

I am interested in the reverse effect, if we had a very large box or planet with mirror walls, that is filled with something that gravitates, will that make the light inside of it blueshift, and generate free energy (negentropy)? ((Thus allowing mankind to exist forever, at least according to the currect state of physics.))
 
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Pony said:
As far as I know, if vacuum antigravitates...
It doesn't, and without that premise the rest of the question makes no sense. Light can be blueshifted as it moves down in a gravitational well, but there is a corresponding redshift on the way back up so no net energy gain from bouncing the light back and forth through the planet.

As it is based on a mistaken premise this thread is closed.
 
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Thread 'Am I understanding the concept of proper frame of reference?'

MOVING CLOCKS In this section, we show that clocks moving at high speeds run slowly. We construct a clock, called a light clock, using a stick of proper lenght ##L_0##, and two mirrors. The two mirrors face each other, and a pulse of light bounces back and forth betweem them. Each time the light pulse strikes one of the mirrors, say the lower mirror, the clock is said to tick. Between successive ticks the light pulse travels a distance ##2L_0## in the proper reference of frame of the clock...
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