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 1d reviewed Approve Differential cross-section for a 2-particle process in the LAB frame 1d comment Can a grounded spherical shell have a charge? Corrected the phrase to "Grounded" 1d revised Can a grounded spherical shell have a charge? corrected terminology 2d revised Cosmic inflation and space flatness edited tags 2d revised Why are they building eLISA and what implications would it have? edited tags Apr 24 comment Utilising Black Holes as a potential energy source @CuriousOne hahaha, okay, really reaching for content to complain with. Apr 24 comment Utilising Black Holes as a potential energy source @NoahP no, that is just assuming that it can convert the gravitational energy to radiation somehow. If you were to assume that the added mass was efficiently fused also, then the energy efficiency would be about $0.7\%$ which is typical of nuclear fusion --- still an order of magnitude less than with a BH. Apr 24 comment Utilising Black Holes as a potential energy source @NoahP great question, the only difference is the radius. A typical star has a radius of about $700,000$ km, which is $200,000$ times more than an equivalent mass BH. So the amount of energy available would be $200,000$ times less! Apr 24 revised Utilising Black Holes as a potential energy source edited body; edited tags Apr 24 answered Utilising Black Holes as a potential energy source Apr 24 comment Utilising Black Holes as a potential energy source @CuriousOne if a main-sequence star and a black hole are both accreting at Eddington, which will produce more emission? Perhaps you should reconsider why they should be considered in the same way then. And in the same vein, perhaps answers instead of pedantic comments. Apr 24 revised How does Compton scattering demonstrate particle over wave behavior? edited tags Apr 24 comment Black hole gravity vs parent star gravity Good answer. I think the it should be, "force would be $10^{10} = 10,000,000,000$ times greater". And the difference in force would be $[(3000 + 2)/3000]^2 \approx 0.001$. Apr 22 revised Will stars disappear from the sky when their particle horizon is outside the event horizon edited tags Apr 22 revised Gravitational waves from neutron star - neutron star merger edited tags Apr 22 reviewed Reject How much Oxygen is in ζ-phase metallic Oxygen? Apr 20 comment Based on our current observations, what all prevents a formed black from experiencing a repulsive force to overcome its gravitational force…? Possible duplicate of Are black holes really singularities? Apr 19 comment Can I re-wind gravity? @CuriousOne yeah, that's obviously why I specific non-zero separations, making it integrable.... and obviously why I specified 'finite' so many times... Apr 19 comment Can I re-wind gravity? @CuriousOne I don't think that's true. For any N-Body system, there will be some precision which will lead to any arbitrary accuracy at any finite time in the future. Additionally, because particle separations will always be non-zero (at some precision), the problem is integrable (at least in a practical sense). As a "Theoretical" concept, there should be no problem with time-irreversibility with the appropriate deterministic algorithms, and "arbitrary" floating point precision. Apr 19 comment In a static bounded universe, what happens to particles that hit the edge? -1, I don't think "Nobody knows... maybe it reflects." is a good, complete or instructive answer; especially with no reference/backing besides analogy for the bounce supposition.