Aside

Upper limit on the Stiffness of space-time

stiffnessAdrian Melissinos
From the recently observed propagation of gravitational waves through space-time an upper limit can be deduced for the stiffness of space-time through which the gravitational wave propagates. The upper limit is extremely weak, implying that the stiffness of space-time is at least 14 orders of magnitude weaker than that of jello.
Read more at https://arxiv.org/pdf/1806.01133.pdf

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