Is the Universe an isolated system?
38293
How does the formation of a solar system not break the second law of thermodynamics?
78769
Assuming that the Cosmological Principle is correct, does this imply that the universe possess an empirically privileged reference frame?
79708
Is the energy density of vacuum uniform in the whole universe?
88141
A family of events such that all proper subfamilies are independent, but the entire family is not
59757
Is a world with constant/decreasing entropy theoretically impossible?
38151
Why is absolute zero considered to be asymptotical? Wouldn't regions such as massive gaps between galaxy clusters have temperatures of absolute zero?
101978
Are the implications of an infinite universe necessarily so unsettling
126980
What happens at the interface between two universes with opposite thermodynamic arrows of time?
105171
Does time pass fastest in isolated, resting space?
95674
Expansion of the Universe, will light from some galaxies never reach us?
3644
Symmetrical twin paradox in a closed universe
58388
Counterexamples to the continuum hypothesis
81969
What if the universe is rotating as a whole?
68425
Electric charge neutrality of the Universe: evidences and theories
81495
Does the universe have a different age to different observers?
112264
Cosmological constant doubts
58404
Does vacuum (empty space) exist?