/r/askscience
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If two planes pass above me at the exact same instant, one travelling at Mach 2 and the other travelling at Mach 8, will I hear them at the same time?
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If a black hole is just a mass exerting enough gravitational force to make its escape velocity higher than the speed of light, can there be masses that are close to this, but not quite at that threshold, that would appear to be darker than usual?
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Does the discovery of gravitational waves mean that eventually we will be able to detect and map dark matter as gravity is the only evidence of its existance?
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Why is the Universe’s “local” geometry (e.g. on the surface of the Earth) so similar to Euclidean geometry?
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