Adam Zalcman
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 Nov 5 awarded Yearling Jun 21 awarded Good Answer Feb 6 awarded Nice Answer Nov 5 awarded Yearling Jul 25 awarded Nice Answer Nov 20 comment How positively charged protons remain glued to each other while they should repel each other out of nucleus? No. Electromagnetic force gets weaker there indeed, but strong force does even more. The upshot is that at a slightly greater distances in heavier nuclei the relative significance of electromagnetic force increases. Nov 5 awarded Yearling Aug 7 awarded Enlightened Aug 7 awarded Nice Answer Jul 21 awarded Nice Answer Jan 22 awarded Nice Answer Nov 5 awarded Yearling Oct 1 comment Why the red-shift of distant galaxies is considered to be the effect of expanding spacetime? Simply faster movement of galaxies billions of years ago would show up as anything between strong red shift (for galaxies that happen to move away from our galaxy) to no shift (for galaxies that happen to move transversally) to strong blue shift (for galaxies that happen to move towards our galaxy). Aug 31 comment Difference between deltaV and specific impulse g is Earth's gravity at the surface. It is present in the equations defining specific impulse simply to express the efficiency per weight of the fuel on Earth's surface. Aug 31 revised Difference between deltaV and specific impulse added 12 characters in body Aug 31 answered Difference between deltaV and specific impulse Aug 13 comment Do Lagrangian points actually maintain a fixed distance? Circular orbit is not the consequence, but part of the assumptions in the derivation of the Lagrange points (see the wikipedia article you linked to in the question). The distance between the second and third body isn't negligible, but remains constant due to zero relative velocity. Aug 13 revised Do Lagrangian points actually maintain a fixed distance? added 212 characters in body; added 82 characters in body Aug 13 answered Do Lagrangian points actually maintain a fixed distance? Aug 7 answered What does $\textbf{f} = -\boldsymbol{\nabla} u$ mean in practice and how is it computed?