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    Space and time dilation

    If space is the absence of mass-energy (which are absolute), then how do we know it exists physically (with no observer)? Also is it possible that time does not dilate (isn't time invariant by definition?) but the clocks slow down due to energy conservation principles at work? I am totally...
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    Sophisticated calculations

    How do professional scientists make sophisticated calculations, e.g the [Broken] in general relativity? Are there any special algorithms for this? I'd really like to solve these equations but it's almost impossible without computer help.
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    Stellar size limit

    Astronomers announced that stars have a size limit. What does it say about stars' cores? This is still unknown i'd say. Btw a new yellow star was discovered outside the solar system. Looks very much like our sun.
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    So will there be a theory of everything before 2200?

    Physics is advancing really fast since 1900. In fact, at this level we can explain 3/4 of all physical phenomena but there is a deeper reality which has yet to be discovered. So there are 2 competing theories. One is quantum mechanics which describes the microscopic world and the 2nd is...
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    Planck's units

    How did Max Planck arrive at the constant h = 6.626196 x 10-34 J s? Will we ever reach Planck's temperatures?
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    Energy conservation in General relativity

    This is how highly complex but how is energy conserved in general relativity? Baez says that energy is conserved by installing energy pseudo-tensors into Einstein's field equations but is that it?
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    The math of QM

    What kind of math does QM use (beyond calculus, differential equations and linear algebra)?
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    Is space really expanding?

    This brought me to the question: How can space expand? Does it mean that i can push off the vacuum? Is space some kind of aether of energetic particles? Do we really know what gravity is (i mean except the curvature of spacetime by mass-energy)? If space has a finite shape but is unbound then...